Its exactly similar - does more power to the ground result in more wear? Up the power a lot and do the test. That's exactly how you test these things. Accelerated environment.
But regardless, there will be no testing. Ive been through this before and feel that its naïve to believe that anyone will be looking for proper data.
What happened to me before was in the late 80's/early 90's, where I rode environmentalist said "MTBs will cause increased wear on trails, phosphorous from soil will find its way into the nearby lakes and OVERNIGHT no biking signs went up - effectively reducing my legal riding to ZERO. This happened overnight. Police would sit in parking lots at trailheads and ticket anyone coming out on a bike. They would walk in the woods and ticket anyone on a bike. My daylight riding went to ZERO and the only time I could ride was in the middle of the night when there was no enforcement.
That is what happened to me. There will be no testing - if the powers that be determine that eMTBs are bad for the environment and they don't feel that they can enforce and they lump eMTBs with MTBs, the only places we might be legally able to ride is at places like Fromme and Squamish and MTB centers. Most of my riding is not at a MTB center so, as Ive learned to be, I'm fearful. As people in Marin county what their thoughts are.