If you go down this road make sure that you record how much pearl per pint you use in the mix.

I would also note what gun I used, what size needle, and air pressure at the gun, as well as how many intercoats(clear with pearl) you sprayed.

Do all that and getting a blendable match won't be too much of a problem.

You might also consider just adding the pearl to your base coat color to make things simpler. Lots of oem paint colors out there do this now.

Good luck with your project.