Many body types were reused and engines also. Example the Vette V8 engine was also used for years in the full sized GM station wagons. So Body A, or whatever designation used at the time as you stated could be used across all or most all the brands (Cadillac was sometimes another exception that did not for years have any compact or sub compact models.) Some would have a softer ride or more options for the line up for a luxury alternative, others maybe were built with a different suspension also- again maybe air ride shocks vs standard shocks on another line for a different ride feel. The mentioned Buick Century when it went to front wheel drive, Cutlass Ciera, Pontiac 6000, all were similar cars on the same body and different grills, bumpers maybe rear lights, etc. Chevy Vega (H body) was the same as the Pontiac Astre (which probably was not very well known or as popular or maybe even only in Canada and not the US market at all.)
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