Going by part numbers, I'd say that they are not interchangeable.
A couple years ago, my wife mentioned that the passenger seat in my F wasn't comfortable, she sank down into the seat. I found the support structure intact but stretched. I repaired it using a nylon strap woven back and forth through the metal seat base structure. She finds the seat much more comfortable now.
My 1996 Discovery has a similar type of foam support structure and it broke on the driver's seat this past fall. I repaired it using a nylon strap woven back and forth through the metal seat base structure. 6 months on and the nylon strap is working fine.