DME 7.2 vs. 7.8...

I have a 2002 Boxster S (3.2L). I am swapping a 3.4L from a 06 Cayman S into it.

I know that I have DME 7.2. I also know that the new engine has 7.8.

Here is my question: Are these DME's different hardware or just different programming (maybe with different pins connected)?

If it is only software, can our 7.2 computers be flashed to 7.8?

Also, has anyone on here done this particular swap?

Thanks in advance