Nobody will notice but you.. lol
Some pigments are photereactive and maybe it will lighen up once it cures good. You could try color sanding (1200 or Ult Fine grit wet) it, in about a week or two, down the whole side. Then clear coat the whole side.
If the blend area was nice and tapered, that should help. BUT. I have seem some silver and gunmetal shades get worse after that.
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