Evo vs Vr4 head , DSM 1g vs 2g head

There are much confusion between the 1G vs 2G DSM head. The 1G head is similar to the VR4 Head while the 2G head is similar to the Evo 1,2,3. There is another head stamped 1.8L which is similar to the VR4 but instead of 47cc , it is a 43cc combustion chamber.

Below is 2G vs Evo III Intake manifold