If you post just scene file, textures are not attached, so if someone open your scene file, texture will be black. For later you need to save scene with command File/Save Project With Asstes..., then zip created folder (scene plus "tex" folder where are attached all textures) and post it here as zip file. (or link to dropbox location if file is bigger then cafe attachment allow...)
So, if it´s pure texture, you could use standard texturing tools inside bodypaint. Edit texture using magic wand (selection of color you want in some tolerance), adjust/set new color and with fill layer