As Cyclops mentioned, V2s are not MHS compatible which means they are able to mix and match with the other 95% of US products.
I think you meant that they are NOT able to mix and match with 95% of the US products.
V2's are only compatible with other v2's.
V3, V4, V5, and other non-V are all compatible with each other.
Despite the name, the Archon v2.1 is NOT v2 compatible. However, it is compatible with the v3's, v4's, etc.