https://www.coca-cola.com/us/en/brands/coca-cola/products/or...
For a 20oz (591mL) regular US Coke it's 75mg of sodium. A Mexican Coke is 355mL and has 85mg of sodium. A US 20oz has more coke and less sodium.
Your point is that US products are larger, which is generally true, and people typically consume an entire product at once, thus getting more total sugar (and water).
The percentage DV isn't telling you how much of the food is sodium, it's some reference to some "ideal" diet and food intake.
If the percentage of the drink was the same, the larger serving would have a higher amount in milligrams. But despite being almost 240mL more it has fewer total milligrams of sodium! .13mg/mL (US), the other is .24mg/mL(MX).
Is .24 == .13? Which is a bigger number?
So repeat after me, the %DV is meaningless. It's not telling you what you think it is.
Comparing, my costco mexican coke = 85mg sodium in 355mL, my gas station coke = 75mg in 591mL.
Plus the whole smell == taste thing to account for. Maybe drinking from a straw obscured the smells you can get versus an opened can.
To use a term from wine, it tastes "drier". And less viscous. I first noticed this as a kid when trying soda from McDonald's (I believe at the time, back in the 1980s, cane sugar was used to make canned coke in the US, while I think the fountain soda was HFCS already. My memory and facts could be faulty, though).