They feel the same to me, but I went on the sellers etsy page to double check and in the description for each deck. It says they are 70 x 120mm with radius corners on 350gsm Zanta Games Board. I bought my decks all at the same time in a bundle, so I don't know if the card stock has changed at all when Blue Stone was first released. I agree, they are pretty thick cards. I am an overhand shuffler, so I'm not sure what it would be like to riffle shuffle them.
I bought them in a bundle too, but the blue stone is definitely thinner and easy to riffle shuffle while the aon is very stiff, it looks like a 400gsm to me. It’s a pity because I love this deck, but the cardstock is definitely too cardboardy and impossible to riffle shuffle 😭
