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If you really want it to look right, I'd replace the pieces with new ones. Just depends on how bad it bugs you. If money is tight, sure, go for the sand and paint, but it won't turn out like new.
how did it get soo scratched? You can get color matched interior paint... Just sand it all down until no more scrathes...even if your sanding an indent, then fill in the indent, primer and paint.