Can I have two different versions of the same app in Extras-testing at the same time? If possible, is it recommended?

The reason I'm asking is that I have a version in Extras-testing, which is only a minor update compared to the version in Extras. It already has enough votes. I just need to wait for the quarantine time to end before I can promote it.

But now I made a new version which has pretty major changes in Extras-devel. While I tested as well as I can by myself, I need feedback. However, I can't seem to get enough of tester in Extras-devel, so I though of promoting it to Extras-testing for having more people testing it. Is this recommended?