Porn and escorting are two different -- but related -- sets of skills.
Porn is about performing for the camera. When filming porn, you sometimes have to feign having more fun than you actually are. Some guys are more vocal, etc., than they would be "in real life." It's more important to look good than to fuck well, in a sense.
Escorting is about connection with and giving pleasure to/having pleasure with the person who hired you. You're essentially "performing" for a person.