A coach can switch courtesy runners as indicated provided the new courtesy runner is a legal sub and has not been a courtesy runner for another position (not for the pitcher in your example). While he could make such a substitution a pinch runner for the catcher, it would serve no purpose to do so at that time, and would not be good coaching tactic.
If not entered as a sub for the catcher, both players would remain eligible as legal courtesy runners for the catcher. Both players may also enter the game elsewhere in the lineup as a sub, but doing so would then negate their future eligibility to be a courtesy runner for the catcher.
Just my opinion,
Freix
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