You limited your answers to people that have the same color as you. You didn't provide enough information for people to help you in "other" ways. For example providing your year of production.
Here is a website that popped up with a simple google search for "gm paint codes by year".
https://paintref.com/cgi-bin/colorco...y.cgi?manuf=GM
But we don't know your year so a google search of "what year did GM use atlantic blue" produced the results of 94 thru 96. So now we have a starting point.
Then we discover that paint information is ALSO on your RPO label in your glove box.
This also came up during a search
https://www.automotivetouchup.com/paint-codes/gmc.htm
You should see 158A on your RPO label indicating "Atlantic Blue". The other number will yield the grey color.