User blog comment:IamJakuhoRaikoben/Chapter 361: The Two Bombs, Review./@comment-5668006-20131122181035/@comment-7418318-20131122223929

Tristan is right. Both can heal wounds on others.

But the stuff they can do additionally to healing wounds differs. Wendy can also restore stamina (or cure exhaustion, if you prefer that wording), heal poisons and some other conditions (like motion sickness). And she has her buffs.

As far as we know, Chelia can only heal others and herself.