Answer: interchangeable

AnswerCrossword Clue
INTERCHANGEABLEReciprocal.
INTERCHANGEABLELike some machine parts
INTERCHANGEABLEEasy to swap out
interchangeableApparently identical; very similar
interchangeable(of two things) Able to be interchanged
interchangeablecapable of being interchanged