If the salts are different, it will definitely change. On the other hand, using the same salt twice will change the hash if it's put before the data, but not i

If the salts are different, it will definitely change. On the other hand, using the same salt twice will change the hash if it's put before the data, but not if it's put after the data. Given an MD5 collision, you can apply a common suffix and still have a hash collision. Applying a common prefix changes the state the hash process is in when it reaches the colliding data and this breaks the collision.