Do not get hung up on the NAME given to the color. For whatever reason, the paint manufactures often gave their own name to a color, as in: PPG, Dupont, R-M each could have a different name that is also different then GM called it & all be the same code. I have also seen where the sales brochures, ect. were different names than what the vehicle sticker is named within GM.
What your looking for is the CODE, but you need to be sure the chart/book, ect. your looking at is for "Truck"...up until something in the mid '90's, there were Car colors & Truck colors...you could have code 27 that was Metallic Blue, but the color was different. Hope this helps, Lorne