I don’t drink beer - allergy (give me rye, scotch or sake instead). But I will attest to Coca-Cola being much better out of the short bottles than out of a can or long bottle...despite them telling me they are the same product. They do taste different.
Those little bottles of Coke are probably made in Mexico. They are using actual sugar as opposed to high fructose corn syrup. It's not surprising that you can tell the difference.