In many cases, the fan itself is the same. The heatsink that the fan is attached to, however, will likely be different and not necessarily compatible.
As I said, the fan itself may be interchangeable - but this statement has to be qualified:
- What isn't interchangeable is the heatsink unit that the fan is attached to.
- How the fan attaches to the heatsink may be different (which could result in the fan jamming and not spinning or making noises).
I have to ask: Why do you want to do this?