Rabbits are not easy to ***, especially with a photo. In any case I strongly advise you against putting those rabbits together. Rabbits aren't dogs, doing a meet and greet with no purpose is not a good idea. They don't like new experience, new rabbits, new people, new places or new nothing. It's worth it to change their habits if it's to improve their life in the long term (like introducing rabbits to pair them up) but it's best to avoid stressing them out for no reason.
If it's indeed a male, they could mate an you could find yourself with a pregnant doe (with all the risks that entails for your doe). Your rabbit might also not be very amenable to the male's advances and it might end up badly. If it's a doe, two does will tend to fight as does are generally really territorial and don't take kindly to strange rabbits entering their territory. If they unexpectedly do like each other at first sight, separating them after making them bond is just cruel and you apparently have no intention of keeping the rabbit you've found. And if they don't like each other, they could fight and seriously hurt each other before you have the time to intervene. Besides, I'm gonna guess you didn't quarantine the new bunny. Considering you've found this rabbit outside, he or she could carry all kind of illnesses you don't know about and some things are really contagious. I know someone who gave pasteurella to her rabbit this way (the rabbit ended up dying and left a very costly bill at the vet). I really wouldn't risk it. If you want to pair your bunny with another, that's great. But find a neutered male, already quarantined, after spaying your female (considering you are planning to do it) and introduce them correctly.
