I have just been able to record the same style endings from E-A7 (from the Sudclavier demo) AND the BK-9 (from Roland's own demo). It's the same Big Band style. The BK-9 sounds much richer! As Sudclavier has obviously recorded via line-in, assuming in good quality, this would mean BK-9 sounds richer. But it could be due to the recording quality. Anyway, the style is exactly the same.
I attach the comparison file!
P.S.: I'll make a new thread about this.