I've done a little search through the games. I own one but never played the other. Are they both made by the same company or something? I know they both have a place called "Shibuya" , and each has a character named "Beat"
Absoloutly nothing in common other than the facts you pointed out there. Enix didn't make JSRF, i forget who did but it wasn't them. Beat is a common nickname for the two games considering the characters who use the name. I have played both extently, it's japanese teenagers in both in common japanese locations, nothing more.