Heres is a super trick that will work.Get some DermaMatch to match you color.What you have to do is fade the two colors into one.
Use the 4 inch foam roller I taked about in another post and get a can of GotToBe Glued freeze spray.Use the GTBG to wet the foam roller and then get some
DermaMatch on it and start playing around on blending.Sooner or later you are going to get it spot on.Buy me a drink in the future.Good luck