Pixel Hex 1 and Pixel Hex 2 are completely separate. I don't think it would be appropriate to resell the same assets in multiple packs! Pixel Hex 1 was my original set I created a couple of years ago, and as such it's a bit more simple. Each has different 'themes' the other set doesn't have. However, each pack can function by itself, or you can mix and match. It's generally up to you!