Backlighting in the speedo
If you pull the instrument cluster out of each car, pop them apart and pull off the face look at the back and you'll see the Chevy has plain white and the Pontiac has "warm red".
There are other bulbs in other areas that Pontiac's specifically have little red bulbs that are only available at the dealer (at least that's the only place I can find them) but otherwise, all use a clear/white 194 or 189 bulb for lighting.


