[mike mueller]

Same size.....

The housing are different but the difference is too slight for a compliant bushings. I make roller needle bearings and there is enough of a difference to have the rear bushing insert .010"
smaller than the front so that the press fit is not too hard.
(something like that, don't have my notes or drawings in front of me)

If you have a Dremel, I'd cut spiral grooves into the bushings and use the supplied grease for sure.

Press the bushings into the housing first, then focus on how well they fit onto the a-arms.