Often, you see them the same color as the garage door.

garage door and cladding are pretty close in color. Paint store told me same as front but I was a little skeptical-too many colors at the side almond siding, brown downspout and hem cladding another color. Is three not the limit?

Front door is the focal point and should be the only door in the accent color. Other doors usually match trim

You may want to have the front door color mixed 25% lighter for the side door! It will be the same hue only not as much saturation.