There are actually two K sounds. If you say “keen” and “cool” you might hear the difference. They are allophones in English. “Allophones” means two sounds that are considered as variants of the same sound. read more
Even where a language (say, English) has a "standard" pronunciation of a word taken from a "foreign" language (say, Arabic), there may be (and actually are, in Arabic) different dialects and/or pronunciation styles, and no agreement on a standard pronunciation. read more