Second what Blue said, I've got both and yes it would be possible as the tub and drivetrain are the same, but by the time you purchase all the parts needed you'll be close to the price of a new buggy kit.

About the only way it could work out cheaper is if you intend to hop it up with alloy bits and pieces - I did assemble a TT02 from spares and upgrades but it's less complicated than the B versions.

Good luck,
Crouch