Weapon stat difference US v USMC

[CharlieFH]

I've been playing Duff's Mekong Delta campaign and I noticed that the USMC UH-1E+ Iroquois has two weapons called '7.62mm M134 Gat.' However, the US AH-1G SMASH has a weapon called '7.62 Minigun.' I assumed the difference was just in the nomenclature, but on closer inspection I noticed that the stats are different too. The USMC version has a accuracy of 39 and a HE kill of 12, where as the US version has an accuracy of 24 and a HE kill of 16. Also, it seems the USMC version produces the correct whirling Gatling gun sound, the US version simply makes the standard light machine gun sound effect.

Being that the USMC version makes the correct sound effect, I assume that is the 'correct' version, but I may be wrong. Does anyone know which version has the intended stats? Do the differences in accuracy and HE kill offset each other?