So, were you missing any items?
When shipping labels are printed from eBay shipping, they rarely get the item weight or package size right. It usually depends on how much padding the seller may add to the packaging. Unless the seller left an item you ordered out of the package, I don’t see the issue here.
also to clarify, as far as shipping charges, did he charge more for one than the other? I ask because I usually offer free shipping on my items and if the weight difference is significant, eBay will send me an additional charge to make up the difference for the purchased shipping label. Were you charged for a service like priority but items sent first class?