Hi Joakim,
Both the spring - flowering Pleione and the autumn ones grow at the same time. It is only the flowering time that is different. The Spring ones flower at the start of their season, the autumn ones at the end of their season, but the leaf growth is the same. So I can treat them all the same way.
A reverse cross could come out with different results. You never know until you try it - which is all part of the fun!
Kind regards
Paul