Exchanged
substituted, interchanged, replaced, commutated, reciprocated, transposed, transferred, shuffled, inverted, switched, swapped*, replaced, traded, bartered, returned, displaced, supplanted, reversed, reverted, restored, retracted, alternated, rotated, surrogated.
Antonyms placed*, stored, kept.
Altered
adjusted, adapted, qualified, reconditioned, modified, limited, reformed, shifted, moved, mutated, permutated, deteriorated, aged, become run-down, restated, rewritten, conditioned, modernized, remodeled, renovated, reprogrammed, rescheduled, reorganized, redone, done over, brought up to date, revised, amended, edited, moderated, modulated, inflected, innovated, deviated, diverted, warped, matured, developed, disguised; see also altered 2.
Antonyms unchanged*, unvaried, unmodified.
Transformed
remade, recreated, converted, transfigured, metamorphosed, transmuted, transmogrified, transubstantiated, transmigrated, suffered a sea change.
Antonyms permanent*, stabilized, final.