Ok, i've seen a few people saying they were going to reg under 2 skins for the holiday fr's on acr/bcp, so i went to live chat to get confirmation that this isn't allowed.

I was on acr and asked "Are we allowed to register for the holiday freerolls on here and also reg on another skin (ie bcp)"

this is the response:

Marcos L:
That is consider collusion actually
15:45me:
that is what i thought,
15:46me:
what if you get knocked out during late reg., Can you then go to other skin and register after you are already knocked out here?
15:47Marcos L:
That will be OK

So you can't be registered and alive under 2 skins, but you can play like a nut and either get big stack or get knocked out during late reg (these are on demands, so there will be late reg) and then reg under other skin.