Comparing: VK 45.02 (P) Ausf. B7 vs. O-Ni

Variants with forward-mounted turret and rear-mounted turret were designed by Ferdinand Porsche. The tank never saw mass production.

A further development of the O-I with improved anti-tank guns. The military command's plan was to improve the earlier models and achieve a higher level of armor protection on the vehicle. Existed only in blueprints. No finished prototypes were built and the vehicle never saw action.