I'm looking at some Naniwa 400 grit stones and it looks like there are two different kinds. One is a Naniwa Chosera 400 and the other is a Naniwa Super 400. The Super is around $20-$30 less than the other stone on most sites.

For reference I'll post links to the two stones here if it helps.
https://www.amazon.com/dp/B003V3PLMU...iglink20401-20

https://www.ebay.com/itm/172919896673?rmvSB=true

Aside from the color and thickness differences, do you think they are the same stone or same quality?

Thanks guys.