94/95 Sierra head units interchangeable???

Hi
I'm trying to find out whether the factory cd head unit from a 1995 Sierra 3500 can fit and work in a 1994 model?
Currently, the 94 has the factory non-cd head unit, with the cassette deck mounted separately under the hvac fans to the right of the head unit.
I'd like to replace the 94 deck with a factory 95 unit that has the built in cd player.
while keeping the factory look.
Anyone know?
Are the bezels the same size?
How about the wiring harnesses?
etc.

Thanks!