On my last turn, I attacked with Zeraora V's "Cross Fist" attack. If I use a different Zeraora V's "Cross Fist" this turn, will it do extra damage?
Yes, that would work.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH6_53
SWSH6_53