yes you can do player to player transfers from carbon to aced or to pdc. ONly those 3, none of the other merge sites, those three are basically same. And yes if you have an account on 2 or 3 of those 3 you can transfer to yourself as long as you are verified ( on the one you are sending from). I've done it myself, just to see if it worked. I am verified on both my carbon and aced account and have done a player to player transfer from my carbon account to my aced account. Have no idea about cake/lock.