Sanding threw to sanded single stage

rsss396

Newbie
I laid 3 coats of spi single stage black, sanded then laid another 3 coats but on the last flow coat I go a few pretty good runs that will take a decent amount of sanding to fix.
If I sand threw to the first session of paint will it be another shade after buffing? There was about a week of cure time on on the first session before I topcoated it
 
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