You just created a new script and it needs the color from another script? Usually you would remember the RGB values, but there's a way to do it quicker.
- select all the scripts you want to assign a new color
- select also one script with the color you desire
- right-click on the script head of the script with the color and choose 'set color'
- see that the dialog has the color from that script, so now just click ok
there you go.