Emu XL-7 & MP-7 User's Group

Hi,
I want to convert my XL7 into an MP7, and just wanted to check which 
ROM I need to get.  I found the Pure Phatt rom on ebay here:

http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&item=2552611096&category=1287

... but I remember reading here that there are different versions of 
this ROM.  Basically, I want to install the ROM, wipe all the XL7 
patterns, install the MP7 patterns, and have a virtual MP7.  Anything 
I need to look out for?
Thanks,
grimley