Leaked Rom upgrade question (using nonstock already)

[landale]

I upgraded to an early WM 6.1 ROM for the sprint touch a few months ago and was hoping the official release would be out by now but really can't wait any longer for GPS. I feel like I have seen that you need to be the original stock ROM in order to use the leaked one. Can anyone confirm if this is true or can I just use the leaked ROM with my Touch as is with the early hacked WM6.1 ROM. Thanks for the help.