Never seen the Sport Kilt Commando, though I have seen there lesser models. I have seen the UK Survival and the rest of the UK product line.
The Survival costs twice as much as the Commando, has removable pockets and a 20 microbrew capacity. It is the top of the UK product line. Generally SK is lighter weight construction than a UK, but then again they cost less too. I would suspect this an apples to oranges comparison.

I'm a big fan of UK's in general, but getting your hands on the one you want can be an endurance contest. All of the head honchos of UK are at the men's clothing trade show in Las Vegas this week, so that might be why you can't get a straight answer.

Best regards,

Jake