hehe, shot in the nuts....
motor endbell color means very little... unless we're talking TOMY brand motors. those are always consistant.
my bitmod 3.5 had a pink endbell, while my 3.2 had a white endbell, and the 3.8 also had a white endbell. JDMtoys 3.8 also has a white endbell... they're running out of colors, so i guess 4.0's gonna have an assload of overlap...
all just chillax...