SM-G960U BYOD FIRMWARE CSC QUESTION

Greetings,

I'm waiting on an Xfinity Mobile SIM to arrive and in the meantime getting my software in order.  I've seen older posts saying to use the CCT (Comcast) CSC but when I'm browsing the firmware sites I'm also seeing identical builds almost down to the second also filed under CHA (Xfinity Mobile). Just wondering what the deal was with the 2 different CSCs?  Are the software packages different between them? Is CCT being depreciated? Should I be using one or the other?? ETC.  I've got both just incase but I'd rather not waste time flashing back and forth just to figure out one of them doesn't work or whatever.

Thanks very much for your time 😃