Pilots are now free to bid across fleets. The "fence" set up after the merger was announced has since been lifted as the airline is now operating under a single operating certificate. While I don't know of any, I'm sure there are a few PMDL pilots flying the Whale now, just as there are ex-Airbus drivers on the 767 and vice versa.

Might be more appropriate to ask this question at airlinepilotforums.com, though.