This is a success story.
Working with Pagemaker 7.0.1a on Windows 7
Saved as .pmd files and reopened and saved in Indesign
The driver is part of the document set up, because the text layout depends on the printer properties. Only affects text flow. The most important thing is the resolution, so try to match it.
With a different driver your text flow will shift, but it's also going to shift when you convert it to in design. While I am normally fanatical about matching the printer driver, and not using windows 7, in this case it should work fine, as you will have to go into ID and fix your text anyway. Just don't be surprised if Pagemaker spontaneously stops working.