Hi, if they recoloured and did not seal, you may find it comes off with an intensive leather cleaner, such as Glyptone (think that is how it is spelt). I remember cleaning the oatmeal seats on my old XJ a few years ago and ending up with a patch where it removed a prior owners/dealers repair - however in my case I could not tell beforehand that a repair had been done. Cost me £115 to get it resprayed and sealed.
Good luck
Mark
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