WOW. Those cars sure gain in value in last year. I bought my diesel for much less when it was 8 years old.
Coming to your question, 60k miles difference is nothing on those 1 million rated engines, but if you would sell the car in a year or 2, the common perception will allow you to recoup the $4k price difference.
If you plan to drive the car for 500,000 miles, like I do, the mileage difference will be marginal, while 4 grands is 4 grands.
I would make sure the cheaper car is in good condition, especially paint job, what is irreplaceable item on those cars.
Than negotiation comes to play. I bet the owner of more expensive car will be more willing to lower the price, than the owner of the cheaper one.
Good luck and welcome to the forum.
I see you did your homework and are going for the best drive on the market