If my Snorlax is affected by its "Thumping Snore" attack but then on my opponent's turn they use an effect that puts Snorlax to sleep, does the 2 coin flip effect of "Thumping Snore" get replaced by the regular 1 coin flip effect during Pokemon Checkup?

The newer sleep condition would replace Thumping Snore’s sleep condition, so you would now only have to flip 1 coin instead of 2.

Relevant cards

SWSH11_143