Try this as an example/tutorial: Take out a skin tone, and put another skin tone that doesn;t quite match on a l;ayer above it. Make an Adjustment Layer (bottom of the Layers Palette - the circle that's split half black, half white) of not only Hue/Sat but Levels. Put them above the skin tone layer you want to correct/match. Hold Alt (or Option for Mac users) and click on the line between the skin tone and the Adj Layer to "lock" them together. Now double-click on one Adj Layer at a time and make your adjustments - changing the colors to be closer, and the Levels to be the same richness and color fine tuning as well - don't just leave it at RGB adjustments either - click the down arrow and select the colors most "off" and tweak them until they match closely. Good luck, and I hope that will help you in PS. -Lew ;-)