I would have thought the "Normal" was bothwell just because you can see the mesh lines (diagnal criss cross) better, but showing them together it does seem that there is stronger vertical lines in the first image hence you are correct. I believe there is a thickness gauge but its hard enough gauging solid materials so gauging soft paper would probably require a microscope as well.
Yes, the thickness is also very different between them. The maybe Bothwell looks a lot thinner, almost transparent and the whole stamp design shows through the paper. The maybe thick soft paper is whiter and thicker.
I am also stating to think that the purchase mentionned here https://goscf.com/t/22595 is all on Bothwell paper. This would explain why the 5 cent is missing
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