I've been thinking about this from the point of view of someone who hardly ever drinks coke but does drink beer (in case you didn't know!), and there is a comparison (no, really)...
Take Guinness. Until last year, Guinness was brewed in three places in the world - Dublin, Park Royal in North West London, and Nigeria. I've never had Nigerian Guinness, but Dublin and London Guinness did taste different, despite having the same ingredients and the same brewing technique - the only difference was water from the Liffey or water from an underground spring.
Also, Youngs beer which was previously brewed in Wandsworth is now brewed in Bedford. It has the same ingredients, the same brewing process, they have even moved the Master Brewer up to make sure that they have recreated the original taste...but no matter what they do, they can't get it to taste the same. Something is always different, no matter how hard they try.
Coke could be the same.
Vicky