What is unique or rare about the VM Zodiac signs?

[Juan_Sali]

There are some similitudes between some signs of this You are not allowed to view links. Register or Login to view. (dated 1301-1400) and some VMS signs.
Libra
The hand in the left image holds a mechanism similar tothat of the VMS on the right. The plates are also united with 3 ropes or chains.
   

Taurus
The horns have a similar shape.
   

Scorpio
Both animals have 4 for legs and a long tail thougn the left image's legs are shorter or the animal is crouched. 
The left image has lines and points drawn in its back, the VMS seems to have some points too and maybe some lines but the resolution 
on the image is low and I cant see the details.