We have changed CC status levels as a result of a B2B. For online checking in for the second cruise you would still be silver because you had not yet obtained gold status. When you B2B at Port Canaveral you just pop up the stairs and check-in is super easy, and usually you get priority boarding back onto the ship before all other guests, including concierge.
What this means is that your chance to reserve excursions, on board activities, port arrival time (not that it matters on a B2B) is based on your silver status. When you check in for the second cruise, make sure that they have you marked as now being gold. You want to be sure to get your new lanyard AND your shopping discounts.