Are 1965 Formula S brakes the same as 1965 Signet convert 273 2 barrel brakes?

And all this time I thought someone changed the entire differential assembly. I never stopped to think just the carrier had been changed, that is something to think about. It is an automatic transmission model. I wonder if the 8 3/4 option is noted on my build sheet somewhere? I see no self adjusters on the rear drums, only on the front. Only one rear drum has cooling fins. So the mystery continues.