Ok, so after playing around on the internet, this is what I found.
Glow PlugsAll Duramax engines use one glow plug per cylinder. The gold-colored LB7 glow plugs are 12-volt heaters that are energized prior to starting the engine, and they may also be operated for a short time after the engine has started (up to 30 seconds). The LLY, LBZ, and LMM engines use silver-colored glow plugs and operate on 4.7 volts.
To meet 2001 California emissions, a solid-state glow plug controller operated by the ECM had dominion over heating each cylinder separately.
During typical glow plug operation, 110-amp current is applied for 1.8 seconds, decreasing to the 30 amps that are necessary to keep the tip at 1,832 degrees F.
The silver (LLY) and gold (LB7) glow plugs can't be interchanged. Use of the gold glow plugs in place of the silver will result in hard starting due to a lack of heat. Using the silver glow plugs in place of the gold will cause possible failure to the glow plugs, cylinder head, and internal engine damage.
Read more: Duramax Diesel Electronics - Diesel Tech - Diesel Power Magazine
So what I take from the above is as long as its a gold glow plug I should be good. And the reason I originally asked the question was that I went on RockAuto to look at pricing and I saw a $31 glow plug that stated California Diagnostics so I guess my next question would be, what does that mean and do I need that?