I think u can do it...but i can't tell what u are thinking when u say make it better and edit.
U can't use the same base of the texture and just add shades, texture to objects, etc and use the same line design as the other drawing. If u move the lines, make newones, etc it should perfectly legal. And nobody can tell that u used an older set. Tomake this one.
Just make it look different and its ok.
Anyway. Make sure that u read the rules of art board and make sure that u move cleverly around them. This is all i can say.
Maybe post an example of a old texture and a new one that u say its different and people can give out better oppinions.