The rubber mats that I have in my 2018 are from my 2011 LEAF. The rears fit perfectly, and the fronts fit almost perfectly. The floor pan is a little different on the side of the pan under the seats. But besides that, they work just fine.
2018 LEAF SL
Delivery April 10 2018
2014 LEAF SV
Delivery May 23 2014
50,000+ miles - all 12 bars - Same range as new - No warranty issues ever!