Is an ECM for a 94-96 B350/3500 interchangable with a 94-96 Ram Pickup? The part numbers are different. The B350 calls for a R4886671/56028265. Checking on eBay says not compatible, but does anyone have any experience that disproves this?

 

With the exception of the two letters at the end (AA, AB, AE, etc.) The numbers have to match, if they don't it is not compatible.