The griffins and thorny dragons are clearly new creatures, that's why they're neutral, but what about the others? I'm considering using this as a hub world and the ability to tame the "starter" creatures (vultures, jerboa, horses, and archas [+untameable insects]) that spawn around this map would be incredibly cool. But if every creature here is a new one like the griffins, they couldn't be transferred.

I'll do some testing and reply back.

All of the other creatures I tested transferred fine, only ones I left out were the lystro and the non-tameable ones (including caged creatures).