Hi, I was listening to different native Dutch/Flemish speakers on YouTube and my Dutch learning materials (Teach yourself series) pronouncing these two numbers 'vijf' and 'twintig'. However, they seemed to give slightly different pronunciations. For 'vijf', some would say the 'ij' like 'i' in American English 'five' and others would say it almost like 'a' as in English 'fate'. For 'twintig', some would say 'ig' like unstressed English 'e' + Scottish 'ch' while others would pronounce it like in German 'zwanzig'. If my observation is correct, is that the difference between Northern Dutch and Southern Dutch? Also I wonder if I'm in Amsterdam, which pronounciations will I hear? Thanks!