Top of dash paint question?

[old Chevy guy]

When I gutted the cab that I rebuilt I noticed the top of the dash was flat black. I didn't really think that much of it thinking somebody spray bombed it or something But now as I'm robbing parts off my parts trucks to put this cab back together I notice that none of them seem to be color matched on top of the dash. Is that on purpose to limit glare from a glossy surface off the glass or what? getting ready to put in the glass and the dash pad so if I need to paint that area now's the time. Any info and paint color recommendations is appreciated , thanks.