For those who are interested. Response from DID.
Hello Peter,
We appreciate you reaching out!
Long story short, the ZVM-X2 chains have our most up-to-date X-Ring seal technology, which is thinner than our old X-Ring. Because the seal is thinner, so is the ZVM-X2.
The ZVM-X chains are more wide and have a longer pin length in comparison to the new ZVM-X2.
Hope that helps and please let us know if you have any additional questions.
Thank you,