Board Thread:LOC General Discussion/@comment-216.125.251.254-20130204164334/@comment-5616072-20130719171221

if it's PM it will contribute a tiny little bit more to the card-level enhancement of the card you are enhancing... but not enough to be worth it.

if the card youre enhancing is already max level and you're just burning cards to get the skill higher then no, as Axelaspeed said, it makes no difference whatsoever.