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.lenconNorth Face is high quality stuff. But like you said I have no idea how to compare it when they say g/m instead of K. That being said I have Bloom and have yet to get wet. HIghly recommend. Stylish and affordable, oh and durability hasn't been a problem either.
.lenconI don't own any technical North Face cause it freaking expensive, but I have used some of my dads stuff. Honestly they both functioned pretty equally. I even like the Bloom more cause they cater to free skiing kind of so there vents, magnets, gaiters, all sorts of cool shit.
roach1324grams/m*2 usually is used to refer to breathability (the amount of water vapor that passes through a m*2 the fabric in 24hrs)
waterproofness is typically expressed in mm of water that can be put in a 1"x 1" tube before the fabric will leak (20k being 20000mm of water)
of course you could also list waterproofness as grams if you wanted to do the math for how many grams of pressure a mm of water in a 1"^2 tube exerts but that would be kinda weird
There are a bunch of different teirs of hyvent fabric so maybe a link to the pants you are thinking of getting could lead to more helpful answers
The last thing is that seam taping and build quality is sometimes more important than the actual fabric because that's where most leaks happen anyways.
rickmortySpecifically TNF Freedom pants, they're affordable, just can't tell if that's cause they're cheap and shitty or if its actually good value.