I’m not trying to nitpick the details. People have complained about difficulty finding the equivalent in the past. VEX has specifically come out and said finding 100 lb rating may be difficult to find so don’t sweat it, which is why the rule allows for other breaking strengths, making the 550 lb of 1/8" paracord legal, for instance. 3mm has been permitted because it can be hard to find 1/8" in countries not using the imperial system.
For reference, here is one with answers for both 2010-2011 and 2011-2012:
Perhaps more specifically, what is regularly available in the US is paracord. Type III paracord is pretty close. Is it 1/8"? Some of it is closer to 4 mm than 3.18 mm, though the commercial stuff should be close to 1/8" while military is thicker. Is it braided? If you look it up trivially, you’ll think yes, it is. But it’s actually a mix of braided and twisted. You have to go to other types of paracord to get only braided. So is braided with a twisted core legal? It was in 2015-2016, being ruled as braided:
So I fully expect type III paracord to be legal again, even though it’s braided with a twisted core, not just braided.