axle question

Hi I have discovered today that I am going to have to replace my rear axle, due to not been able to get the rotten brake callipers off, the shock mounts have rotted through
So anyway on the plus side I discovered I hav e got a 24 spline diff currently installed, my question is if I get hold of a good casing with callipers etc and it has 12 spline diff in it can I simply swap my diff and shafts over?

Yes

good news there then, are the seals the same aswell?

Yes

Thank you very much