Got a set of 2009 moonwhite color splashguard, but it seems the color didn't matches with my 2011 moonwhite g37 sedan, just need a bit advice

the color tone on the set is a bit orangeish with pearl alike - is this the self heal paint that prior productions 10 above?

 

It could be UV exposure on the 09 has faded it somewhat. This is why paint matching on cars a few years or more older can be difficult.

 

I once had a new 1999 Nissan Maxima SE 5MT in Pearl White, and I kept the paint clean and waxed, garaged every night, but in a parking lot during the day.

On the third year, after getting rear-ended, I had to have the trunk repaired. There was just no getting that new bumper properly color matched by the dealership's body shop, and I kept taking it back. Finally, I just learned to accept that "pearlescent" (word?), three stage paints get a luster to them over the years that is almost impossible to color match.

Two years ago, for my Moonlight White G37, I had my front grille custom painted, black on the inside, and Moonlight White around the perimeter. I gave them my fuel-door flap so they could color match, and yet...

It is what it is. An imperfect thing.

 

Yeah, i actually examined carefully the color seems re-painted aftermarket

 

Colors do fade, but the other issue you may have is the paint on plastic (your splashguards) will look a bit different than on the metal of your fenders. I notice this on brand new cars too. The plastic bumpers look to be a slightly different color than the metal fenders, hood, trunk, etc even though they were painted by the same paint booth