is the carrier bearing and the differential bearing one in the same?

Hello, there are multiple bearings in then rear differential. Often times, the rear differential will get rebuilt in whole with new carrier bearings and differential bearings, as well as a "ring and pinion" assembly. Hands on testing is needed to find out what's going on, but it sounds like perhaps the shop working on then vehicle has identified the concern. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops