The difference is the Fritz was a radio-controled glider bomb, but just a bomb. The V1-V2 were powered and thought to be unstoppable.
The Fritz, if ever added to the game, would require fundamental changes to the game code with how you can remote control or guide something from high alts down to a moving target.
I don't think I'd want to see it in-game, personally.
EDIT: Think of it as a precursor to the LGB, whereas V1 was precursor to a tomahawk cruise missile.