is the caliper bracket for 4piston calipers the same as the one for 2piston calipers?

im thiking of putting the 4piston units i got w/ a disc brake setup for more readily servicable 2piston calipers.

I don't think they are the same ,what year? 68?

yeah theyre off of a 68

67 - 68 disc brake bracket are completely different than those use on the single piston 69 up disc brakes.