@bhumbert yes, you can have the same document in multiple releases. Just keep in mind that each release is its own version of the document.
So if you make changes in Release 1, and you also want those changes to appear in Release 2, you’ll need to manually add or copy those updates into Release 2 as well.
If you don’t, and you publish Release 2 afterward, only the changes from that release will be visible anything done in Release 1 won’t carry over automatically.