AF does not have Economy Comfort, so you're going to be in regular Y - look at your reservation via airfrance.us and contact them for seats - I've had success doing so via their site.

KL...I would use Skype to call their overseas line. I never trust DL assigned seats to hold on KL metal, especially if it's not showing up on the KL website. Even then, with a call, it does not consistenly work.