So long as they are an Allied plane (SH4), and there are different small clones for the various nationalities (with non-conflicting node IDs), you should be fine. In the SoWesPac area in FotRSU, there are several GB AirBases with various US, GB, AU & NZ planes, even some with the same plane model in a small clone, and they seem to spawn just fine - sometimes too much...
But we need more opinion / fact here, gap. Surely someone with more knowledge than the two of us combined can chime in and help us out!
The more discussion, the more knowledge!
Enquiring minds want to know (more)!