Create 4 entirely different field map layouts, map each of them independently to the same PDF document. So the only common setting in the Field Map Designer will be the Select PDF file to work with field. Make sure the Name of Field Map field is different for each Field Map Layout.
Each Field Map Layout will have a different layout parameter and all will work as expected.
This use case will require the 1 SITE | 10 FORMS (or greater) license.
If you experience any issues let us know as we remain at your service.