All sodas, and especially Coke, are pretty transparent that they adapt their formulations by region, plus the water chemistry is different everywhere, so they have to adjust for that too. Labeling laws are also different. I therefore cannot put much stock in anecdotal reports of people finding that one continent's version of a product tastes different than another continent's. In my experience, that is true of every food product there is. My observations come from the US market where brands have often been producing cane sugar "throwback" versions of their sodas in the same bottling plants and for those the sodium content is listed as being a bit higher. Probably that is not the only changed ingredient though.
Passover Coke (similar to Mexican Coke in USA/Canada - made with cane sugar instead of HFCS) lists the same amount of sodium as HFCS Coke (45mg / 12 fl oz):
It makes sense to me that Mexican coke could taste differently for multiple reasons. Most obvious of which could be a recipe tweak.
US vs Mexican Doritos are a good example. The bags look identical, but the US version is cheesier and the Mexican version has a mild kick of lime. Yet you wouldn't glean this from the nutrition label.
- European Coke has zero salt/sodium.
- USA Coke has 75mg per 20 US Fl Oz, which is 127mg per litre.
- Mexican Coke has 130mg per litre.
US: https://www.coca-cola.com/us/en/brands/coca-cola/products/or...
UK: https://www.coca-cola.com/gb/en/brands/coca-cola-original-ta... (and a quick check shows it's the same in Germany)
Mexico: https://tools.myfooddata.com/nutrition-facts/769110/100g/1