i repainted my sons 95 mustang a few years ago. between that and a 2000, the color name was the same, but the paint codes were different and both looked different( some fancy name for metallic red). did an 86 blazer last summer. dark metallic brown factory color. even though the paint code in the glove box was used to get the color, it had a LOT more metallics in it than the original.
when ya go to check out paint chips, it's wise to do it outside in natural sunlight.