RCG/RCGF are the same engines. Though they are only supposed to be selling RCG, it's easy to see in the add copy that you re looking at an RCGF. Hobbyking can't even keep them straight.

The only difference in RCG vs. RCGF is who's selling it (Hobbyking or vendors going through stateside distribution) and who is supporting them after the sale (best of luck with HobbyKing).

The box they come in, and contents will be identical in my experience.