Quote from Annysia
As far as I know if you use the 1.6.4 versions of both mods they have continued to be compatible. I don't use BoP so can't say for sure, but I know I've seen other people post about using both. As far as 1.7 version, I would think they would still be compatible. We will be adding our own world type at some point, but I don't think that will matter as I have seen people use BoP and Highlands, both of which have their own world type. I think the most important thing will be to make sure you aren't duplicating any biome ID's. I know that BoP does use a lot of them, so you will probably have to do some ID changes in the config files.
Thanks for replying but i'm kinda confused if both used there own world type i wouldn't be able to have 1 world with biomes from both mods right? Sorry im kinda new at mods