A→B is equivalent to (A' OR B). These are logically the same and can be used interchangeably.
Construct truth tables for A→B and (A' XOR B) and you'll see they are not logically equivalent.
EDIT: Here's the truth table
EDIT2: Updated truth table with (B iff A), which yes, is logically equivalent to (A' XOR B) and can be used interchangeably.
A B A' (A→B) (A' XOR B) (A' OR B) (B iff A) T T F T T T T T F F F F F F F T T T F T F F F T T T T T