'Background' is for the default window background colour

the other 3 refer to elements with which it's possible to change the background colour as well as the colour of the text they contain:

Code:
//color editbox 4 | color editbox text 3 | editbox -a merry christmas


which shows /color editbox and /color editbox text change different things

"The only excuse for making a useless script is that one admires it intensely" - Oscar Wilde