Just to chime in, a long while back I had plans to use a 2nd generation Camry exhaust (from the cat to the muffler) in lieu of a cat delete on my 1st gen but I decided to go another route.
For what it's worth the 2nd gen is a perfect fit in the "dogleg" section going behind the rear wheel, and also sits perfectly in the middle of the car, the hangers even match up, making it a good candidate. It does have two resonators though, which made the decision where to cut a short one. I went right between them.
This geometry should also be the same across all models and engines types, making the diesel/petrol issue not so severe, except for maybe overall pipe diameter. I do believe the 2nd gen is slightly larger in diameter than the 1st, but the flanges should mate easily. If not a muffler shop should can easily weld a flange to accommodate.