Floor pan help

I am not having any luck finding new replacement floor pans for my 1964 Plymouth Barracuda, everybody is out and nobody knows when they're getting them back in as far as new ones are concerned. I do have a couple of sources for some newer a body floor pans like 70-74 dart, does anybody have any experience or knowledge of how close those four pans maybe in fitting? At least for a patch oh, it's a driver not a restoration