R6 red on a '70 Swinger?

Doesn't look like R6 was available in 1970 Darts. Not sure if it was available in any 1970 vehicle. FE5 replaced it.

I think the aftermarket paint company chip charts aren't super accurate on applications.

https://www.hamtramck-historical.com/images/dealerships/OrderingInformation/1970/P2 1970 D Code List.jpg