FYI I had the washer and axle nut changed on my 2014 some 4 years ago on driver side. The passenger side occassinally needs retorqueing only say once a year or so and have not had to change the washer. Just my experience.
I hope to have a new EV only car by the time that passenger side fully gives out...if it does. Meanwhile I retorque it as needed. When you say new part you mean the 36mm nut vs the 32mm nut? as I recall changed. The bad is you can't torque the new nut without taking off the wheel now! If you meant the 36mm nut is the new part and not the washer then maybe I should use that nut now on the passenger side while the washer is not an issue considering I can retorque the existing nut ok though as I said comes loose sometimes.The new part negates the need for periodic tightening. The procedure is to torque it to a specific value, loosen then re-torque to higher value. Will not come loose. I didn't record the torque values but I'm sure you can find it on the net