It's just different bonding techniques. One's a slow process,, the other is fast track. Then there's also considering whether to start with the normal smaller bonding area or bonding in a larger space. Usually here in the US it's slow track and smaller bonding space initially (though I'm not sure why that's favored here). But every rabbit is different, and what works for one pair of buns may not be the right technique for another pair of buns. You just have to give whatever method you chose, a try. Then adapt as needed, as you observe their behavior and if things aren't progressing in a positive direction. This can be hard for someone new to bonding, which is why I prefer 'love at first sight' matches, especially for carers new to rabbits and rabbit behavior.
When attempting bonding, it's important to have a good understanding of the different bonding techniques, but especially understanding what the signs of escalating aggression are, so you can intervene before a fight breaks out. So I would suggest reading up on those things, and watch different bonding videos so you can get a feel for what positive and aggressive behaviors might look like.
https://rabbitsindoors.weebly.com/bonding-bunnies.html
http://cottontails-rescue.org.uk/information/bonding-bunnies/
https://wabbitwiki.com/wiki/Bonding_rabbits_together
https://www.rabbitsonline.net/threads/when-to-intervene-rabbit-bonding.104770/
https://www.rabbitsonline.net/threads/language-of-lagomorphs-is-it-gone-forever.105436/
https://wabbitwiki.com/wiki/Understanding_your_rabbit
You can sometimes set up a new buns pen in another buns territory without too many issues. I did it with a new boy bun that I got for my lone bun that had lost her bun companion the year before. It didn't cause any issues, except them both being very excited and interested in each other, and theirs ended up being a 'love at first sight match'. But other rabbits may react differently.
Territorial marking around the pen is very possible. You do want to make sure the pen is high enough neither bun can get over, and that there won't be any chance of biting through the bars. But if there's active aggression from either, I would suggest choosing another location for your new bun. Near a kitchen is fine for buns, except some buns don't like the smells of cooking, especially meat. I had a bun that would constantly thump at me whenever cooking was going on
What I would do is let them greet each other at a neutral location when you first bring her home, with her in the carrier or a cage. Just something in between them to prevent any biting or a scuffle breaking out. You're just trying to get an idea of their initial reception of each other before you place her in the pen you've set up in his area. If they aren't showing any signs of obvious aggression, then I would go ahead with putting her in that temporary pen set up for her. You also want to watch out for her being scared and make sure she starts eating and drinking well that first day. If she isn't and is acting scared, she may need to be in a quiet location away from your boy bun, to get settled in and used to her new home first.
Wherever you put her, it's usually a good idea to keep a new bun in their cage that they're used to and feel safe in for the first couple of days. Other familiar things can be used if they don't come in a cage. This helps them feel more secure and safe being in their familiar environment, even if it is small, and will help establish good litter habits, before expanding their area. You can even cover the cage with a light sheet or blanket for an especially nervous bun, to help it have a more tunnel like and safer feel for them.
https://rabbitsindoors.weebly.com/bringing-your-rabbit-home.html
Then once you have her settled, you can gauge how she's responding to you and to your boy bun. If she's approaching the cage bars to look out with curiousity and interest, then it's a good sign that she's not scared and is responding well and likely will do well being around you and your bun.
6 weeks post neuter is usually enough time for the hormones to have faded, to begin initial bonding introductions. Though sometimes waiting 8 weeks or longer is needed for some rabbits. There will still be some dominance humping that can occur when bonding. You just don't want to allow excessive humping, chasing, or circling to continue, as that can quickly escalate into a fight.
I would get her settled in first. If they aren't both showing signs of eager interest in each other, I'd suggest giving her several weeks to get settled and comfortable in her new home, before starting bonding. If it's not love at first sight, the bonding process can be a stressful thing, for them and you, and you just don't want to be overly stressing a new bun in a new home, as this can put them at risk of stopping eating and developing GI stasis. You want to make sure they're eating well and settled well before starting a potentially stressful bonding experience.