Not always apparently. In the example reply #3 using that link and 1157A gets a amber bulb.
While the picture of the 1157A shows amber glass here's what the description says (I added the emphasis):
#1157A Amber Miniature Bulb Bay15d Base - 12.8/14.0 Volt 2.1/0.59 Amp 26.88/8.26 Watt Painted Amber
S8 Double Contact (DC) Index Bayonet (Bay15d) Base. C-6/C-6 Filament Design, 24/2.2 MSCP, 1,200/5,000 Average Rated Hours. 2.0" (50.80mm) Maximum Overall Length (M.O.L.), 1.04" (26.5mm) Maximum Outer Diameter (M.O.D.). 1.25" (31.80mm) Light Center Length (L.C.L).