However they do tend to use the thinner wire for hotter pickups simply so they can get more turns of wire in within the same volume, rather than for the sake of just using thinner wire. So if a standard humbucker measured 8k, a hotter version with 12.5% more winds might measure 9k if the same wire gauge was used, but 10k with 43 AWG wire rather than 42 AWG.

So whilst that 10k looks a lot hotter than 8k, in reality its output won't be as quite a big a jump as the figures suggest.

But unless you know, then all you can do is try them out and see.