True. I understand that drinks manufactures adapt their products to suit different markets. The Fanta "Orange" I've seen in Europe seems paler and possibly less sweet compared to the ones in Africa. I wouldn't be surprised if Coke tasted slightly different depending on which part of the world you happen to be.
UK Fanta contains orange juice and sweetener because of the sugar tax. Had international Fanta (possibly American or Arabic) on a Qatar Airways flight and it was bright orange with no real fruit, and most importantly, sweet and I felt satisfied after half a cup.
Coke does taste differently - the ingredients are different even across Europe. I always look forward to visiting Germany because I always bring a 4-pack back.