I argue that when grappling with the Lucky Break feat, you are able to reroll the Grapple attack action (when failing or critical failing), because the Grapple action clearly states to
Attempt an Athletics check against the target's Fortitude DC.
My own counter-argument would be that Lucky Break says
You can trigger Cat's Luck when you fail or critically fail on an Athletics or Acrobatics skill check [...]
whereas Grapple action says
Attempt an Athletics check [...]
But this counter-argument would require Athletics skill check to be something different from Athletics check and i can't find anything in the Core Rulebook differentiating these wordings. Alternatively, is there something specifically written about using skills in combat like Grapple and Disarm (Attack trait), or Feint and Demoralize (no Attack trait)?