Challenger vs Charger Luggage Rack ???

I have a 1971 Challenger R/T that is coded ( M91 ) luggage rack ......

Friend has a super nice rack he swears is from a "Challenger" ..... however I think ? may be from a "Charger" ?

Question .... Are they different ? Any measurements to confirm ? Any & All help warmly appreciated ! ! !

Dont quote me on it.
But i think the rack is the same. But the stanchions are different

Barracuda/Challenger luggage rack base.

Different part numbers in the factory parts book for B & E bodies.

EDIT,
found a picture online of a B body rack

OUTSTANDING Information ! Thank You !

The B-body rack from GTX6970 is a 68-70 B-body. The 71-72 B-body racks are (I think) identical to the the E-body racks.

I believe you are absolutely correct ! THANK YOU !

I dont think Ive ever seen a rack on a 1971 or later B body

As far as 68-70 B bodies, no 68's had them and only optional on 69-70 Charger. No Coronets or Belvederes were equipped with them as a factory installed option.

My 71 Charger SE had one.