EK2 was part of the original 1969 launch of Chrysler's high-impact paint program — the first wave that established the marketing pattern of vivid colors with divisional names. Dodge sold the color as 'Go Mango'; Plymouth as 'Vitamin C'. Same paint formulation, two divisional marketing words, both attested in the 1969 and 1970 dealer fact-data books.
EK2 is often confused at a glance with EV2 (HEMI Orange / TorRed), which is the deeper, more red-leaning saturated orange that also spans the program. In daylight EK2 reads citrus and pulls toward yellow; EV2 reads warm and pulls toward red. Per the Dodge Garage high-impact retrospective the two were sold concurrently and a buyer ordering 'orange' would have chosen between them on the dealer color chart.