There actually seem to be several forms, all doubtfull in their species-status...
Musa basjoo cultivars
Apparently Jean-Luc Penninckx has a very rich imagination or a keen eye on discovering new species for exploitation
I've seen Sakhalin however, and it is a bit more robust than normal basjoo, a bit more stout, broader leaves,....but it's hard so see if you don't have a normal basjoo standing beside it,...in the same growing conditions that is,...
Kind regards,
Remko.