The change from Travel Related Companies to Centurion Bank was recently discussed here, and is of no practical importance...
http://flyertalk.com/forum/showthread.php?t=664271
Points accumulate in a separate Membership Rewards account. You may have several cards linked to the same MR account, adding a new card will not affect the balance. In fact, your Green card will
not be cancelled if you are approved for a Gold one, unless you specifically request.