Welcome to The Cove!
I am not sure I completely understand you, but I will try to give you a straight answer.
At minimum, controlled documents need to have some way for the reader to know their version is the most recent available. That usually happens with a revision number, but a date might serve too. The archived old copy should be plainly marked "Obsolete" or some such.
These documents will, according to their sensitivity, need change approvals from authorized people who represent the people who use, or will be affected by the process being changed.
If a change form is separate from the document itself, it needs to identify which revision it is for. So, one could argue that both have a revision number. But if a change form is separate from the document it is collecting approvals for, its revision number isn't adequate. The document itself needs this revision information. I like to see it on the front page, as well as the header or footer of every page.
There will be some documents that arguably don't need this kind of change control. Equipment manuals from the manufacturer might not need revision controls if a performance check is done after each repair/PM. A blank requisition form might not need any revision control unless it was getting a critical change and you want to be sure the old version never gets used again.
I hope this helps!