The problem is that apparently HM2 has no way to distinguish these 2 different types of SNG. Therefore, per example, each time I load one fifty50 sng and I choose its HUD (example: HUD_50) to show up by default, this is the same HUD that is opened by default when I load the SNG 9 men.
If for instance, I choose by default the HUD_9men to be assigned to the SNG 9men, next time i load a fifty50, the HUD that will be displayed on this type of SNG will be the HUD_9men when it should be the HUD_50