We have a contenttranslation tag for CX edits generally, but there won't be any way to tell from the change tags which edits are made with CX2 and which with CX1. It is possible to tell this from the Content Translation–specific tables, but we're trying to centralize all our analysis in the Analytics Data Lake, where those tables aren't available.
So can we add one more tag to changes made with CX2? We can stop doing this once we've fully transitioned and go back to just looking at the umbrella contenttranslation tag. I don't have a strong opinion about what the extra tag should be named, but how about contenttranslation-v2?