The asma ul husna are read according to the rules of Quran:the correct pronunciation, movement, and how the words are connected and tajweed. These can be found in books of tajweed and noorani_qaida/Quran primer.
The asma ul husna we hear today gets slightly changed, it may be a change of sounds/vocals for example a male, female, kid , group will all sound differently. A group of people singing will sound like a choir, a kid and a female will have higher pitch of sound than the pitch of a man.
Asma ul husna can have addition of words such as in the fourth link, Allah ho Allah ho was added after each names or darood at the end by the producers/singers etc. These changes may be done to stand out.
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