1929 R316 Kashin tint variations?

[glchen]

I recently purchased a lot of 1929 R316 Kashin's from ebay: Link. One thing that I noticed about the lot was the the cards seemed much whiter than the usual sepia/creme colored tint found in the Kashin's. I had seen a similar tint in a recent SCP auction for a Kashin Gehrig here: Link

When I received the lot, I compared it to the Kashin Gehrig that I already owned, and the tint does seem different. Has anyone seen this before? There were a number of other raw copies in the lot, so I did send one of them to SGC to get their opinion on the card also.

[Leon]

It might have been different storage environments or maybe Kashin had slightly different color paper. I don't recall seeing different shades but quite honestly they just look like normal cards so I probably wouldn't have taken too much note if I did have different paper shades. Nice cards btw...

[leftygrove10]

I have examined the Grove card from this lot and compared it side-by-side to my other ones. The stock is definitely whiter than the stock of the other cards that I have. Also, the stock seems to be more rigid than the stock from my other cards. So I think it is more than just how the cards might have been stored. I think the card stock is actually different.