Jazz has 1 distinguishing feature - a metallic ring around the eye zone. Sometimes the ring looks almost like real metal. Otherwise, it is a very mediocre variety - small bush, small flowers and not an attractive bush either. It does bloom well.
Frankie Blue Eyes has bigger flowers and a more robust bush but I'm now down to one plant of it after not propagating it for a few years. Pretty blue eye so should try to get it going again.
Charlie
I agree with you about Jazz. Even though my bush was a nice size ( thanks to you guys

) It was not really vigorous or upright. I liked it because of the blooms. The one I have now is very small . Its in a 6 inch pot. I hope I can get it to look better than it does soon.
Please try to get FBE going again I always wanted this one from you for over ten years but never could get it.