How important are spring color codes?

My '87 300D rear springs have yellow, red, and white marks in the middle of the spring.

I ordered new springs. One has yellow, red and white, and the other has yelow, blue, and white. Both are same part number.

I ordered them from the dealer who said they'd need to match the pads to the spring colors. When they came with different colors, I called to verify, and they say it doesn't matter.

Is it okay to put these in my car, what do the color codes mean?

-brian