Another 8 3/4 pattern question

should be minimal difference in dimensions between the 2 bearing brands -- but since you have to make a shim change check your pattern after installing the bearing you are going to use for the final set up-
Make shim changes in .003 increments
why not just buy a 741 case pinion shim kit from Ratech Manufacturing # 1109 ( $13.00 ) - available directly from Ratech or thru Summit Racing

rule of thumb for 8-3/4 and Salisbury type differentials ( cover on back of housing )
-- on the drive side of tooth too much toe ( bottom of tooth ) subtract shim
-- on the drive side of tooth too much heel ( top of tooth ) add shim
get the drive side correct and the coast side will follow.