I know there were two versions of the Neo Powerhouse 12 as I owned a pair of Powerhouse 412 cabs at one point. The slightly newer cab (black grill) had much lighter weight drivers then the silver grilled cab. The silver grill cab was rated at 1000 watts and the newer one at 1200 watts. The older cab had a bit warmer tone to it. The newer cab sounded a bit more crisp and articulate. Both appeared to Eminence drivers. I noted my 2008 Walkabout Scout had the older heavier driver in it.
Dwelling on the banks of the deep end.