this can be a pattern
Maybe it's "accent" you're looking for
value and brightness
I doubt you will find a name for something so specific. There is analogous colour scheme that's close to it but the image you have, has colours with same hue and different value. If you want to know how to create it, use hsv colour picker. Chose a hue and select different values of it.
Duotone is similar but it's usually for two contrasting colors instead of two similar ones.
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