Your 70 is not a Superbug, they began in 71.

The main difference is the windshield. The 1303 has a big curved windshield and dash and the 1302 has the same windshield and dash as a Standard Bug.

The front suspension also changed in mid-73, the 1303 has its redesigned suspension with a negative roll radius, simular to the Porsche 944 and VW Golf.