True, but it suggests that there's more than just the tag that's different. You could dump the raw data and analyze it but that's even more work.Anyway, the difference in file size between different shots cannot prove your finding above.
Try a couple photos at different white balances (especially taken in indoor lighting) and then try to match the colours.
If it's just a tag it should be easy...
View attachment 1203
Which WB-setting would you go for?! In my humble opinion, there is none.
Even later at your computer there is nothing neutral grey in the pic to have it adjusted. You simply have to take a decision ... I took the one above!!
Whatever you picked, it's the right setting. The photo looks nice and that's really all that matters.