The only way to find out of there is an equipment change is keep checing on www.seatmap.com. Good luck - or change your eservation to the 250/254.

2 hours is plenty of time to check out the lounge is HKG. Both are great, but different. The Wing is wide open, and has the famous Cabanas. The Pier is more closed in, has daybreak rooms and loads of P.C's. Which one to go to depends on where you arrive and depart from. if both gate numbes are low i.e. 1-25, use the Wing. Anything above that use the Pier. If it's a mix, take your pick. I prefer the Pier, but the Wing gives the quintessential CX lounge experience.