Cryptomator is cooperating with 1&1.
Means, the app that 1&1 provides has cryptomator features included and uses (partially?) the open source code from cryptomator in their 1&1 app.
But it is still an own development by 1&1 and provided by 1&1.
You should be more successful if you place your questions at 1&1 support instead of this board.
I also doubt that the versioning of the 1&1 App equals the versioning of the cryptomator desktop app, because they are different apps with a different roadmap and release-plan (but that’s just a guess).