b-max spur gear options

[clunk]

hi, ive just bought and built a new b-max..

very impressed. ive been out of the 1/10th off road for a couple of years, so hence this question ( maybe silly ! )

would the b44/b4 spur gears be a direct replacement for the yoko one ??
simply 'cus i would have more options than 81 or 87t.

thanks in advance.

mick.