Just went from a 2014 to a 2020:
1. Weathertech floor liners from the front will not transfer. They actually fit well (at least the passenger side did; I didn't try driver), but the holes don't line up.
2. """" for the rear seat WILL transfer. This is the one-piece jobby that covers the hump and both footwells. Fits fine.
3. I had the Mazda OEM cargo tray in the back. It fits OK in the 2020, except for the inserts for the little storage units on each side. You could conceivably cut the cubby liners off of the mats. I just forced it in there, and it sorta works.
(A search here didn't turn up clear answers on this one for me.)
1. Weathertech floor liners from the front will not transfer. They actually fit well (at least the passenger side did; I didn't try driver), but the holes don't line up.
2. """" for the rear seat WILL transfer. This is the one-piece jobby that covers the hump and both footwells. Fits fine.
3. I had the Mazda OEM cargo tray in the back. It fits OK in the 2020, except for the inserts for the little storage units on each side. You could conceivably cut the cubby liners off of the mats. I just forced it in there, and it sorta works.
(A search here didn't turn up clear answers on this one for me.)