DiffApply
DiffApply[diffobj, expr] returns the result of applying the given DiffObject to the expression expr.
DiffApply[diffobj, expr, File["file"]] writes the result of changing expr to file.
Examples
Apply a diff to an expression:
diff = Diff["abc", "aXc"];
DiffApply[diff, "abc"]
(* "aXc" *)Please visit the official Wolfram Language Reference for more details.