they could do the same with NASCAR too, they may be different motors but they are all the same give or take a few numbers, they are just cars made to NASCAR specs with Manufacturer stickers
Edit: as a matter of fact legends too, there is a sedan chassis, a '34 coupe chassis, and a '40 coupe chassis. Which has the '34 Ford and Chevy coupe, '40 ford and chevy coupe, '37 ford and chevy sedan, and the '34 Ford sedan (aka the Bonnie and Clyde cars

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And I know for sure sim setup isn't exact because IRL spring changes of 5 pounds make big differences but in iRacing your options are limited to 25 pound spring changes. so basically by reworking the chassis picture and body we could have awesome looking legends races. But that's probably really really low on that list that doesn't exist in writing but is just there in a few peoples heads.
Edit 2: I got some practice for next week's Mustang at Spa and I got loose coming out of the last sweeper before the chicane before the start/finish line and I slid all the way across the grass hoping I could catch it when I hit the chicane..... NOOOOPE! I launched off the arc where the grass and asphalt meet and bounced off the inside wall and sent me in a barrel roll into the ground then I bounced off the outer wall with the front and blew the motor with the rear axle shoved through the door. At least it was only a test session....