"Here it is beside the earlier version. Can you identify which lens is the later one?"
If you are trying to identify the Nikkor-S with the early and late optical designs, you won't have much luck because both the lenses shown here have the same optics. These are the later type with the modified gauss design
The older Nikkor-S uses a modified Tessar design, the best way to distinguish them are:
1. the older Nikkor-S is always marked 3.5cm, the newer optical design is always marked 35mm
2. The older lens has a longer barrel - 58mm from the mount, the newer one is more compact at 45.5mm