I started my recovery in NA but I have gone to AA meetings on a regular basis throughout the years. For a period of time, I only went to AA meetings and not NA meetings. I have had NA sponsors and AA sponsors. I agree with what others have shared: if it works, don't fix it. The bottom line is that sponsorship is all about working the steps. If your sponsee is doing a good job of working the steps with you, keep a good thing going.