Any rabbit may breed with every other rabbit. The only worry about size difference is when the buck is much larger then the doe, well, actually I haven't read about actual problems, but many fear that the kits might be too big to be born. Can't tell if that's really a problem, but I'm not going to test that.
For a rabbit, any other rabbit is just a rabbit, they don't discriminate for size, colour, breed or whatever.
G1rlVeteran, I don't see any problem with your plan, although it might not result in the most effective meat breed (So what, mine need 16-20 weeks)