Transplanting a grafted Fukushu kumquat tree

[poncirsguy]

Before and after a repot of my Fukushu kumquat tree on Flying dragon.  The top part is 14.5 months old since the T-Bud started growing and the FD roots will be 3 years old 1-1-22.  I guess the big question is If the roots are Flying Dragon and the top is Fukushu and I were to trim the top and transplant the roots Am I  trimming a Fukushu while transplanting a Flying dragon.