I hatched a bunch of LF and Mille fleur bantams at the same time. They were ok for a while, but the LF began to out compete them on food and water to the point I lost 2 and moved the rest. The MF seem more clever and assertive then my RIR or salmon favorelle but not enough to be in with a bunch of sub adult LF. On the other hand, I think I have about 15 LF, and you are talking about 2. That might be ok for a while if they grow up together. If you take 2 new LF adults and throw them in with anything, there will be a revision to the pecking order. My LF hen, in particular, was downright nasty.