It varies from pack to pack and box to box. I’ve opened up gold stars from high mid and low. Some weights were heavy from the lot I bought, but the same weight as lights from a box I’d open up.
Depends on the boxes the packs came from. Boxes even from the same set can have different weights because the lights/heavies inside them also have different weights. Some of those heavies you’re looking at are mine on eBay. I bought them from TCA gaming so I trust they’re heavy, I’ve been buying heavy packs from him ever since I got back into the hobby, but if you can’t compare the weights between the packs from the same boxes to see which are significantly heavier or lighter than the other, the best you have is a guess as to whether your packs are heavy or not.