you should go do some research, Tal Yasis Is 1 niggun. the Chazzonisher one was by R’ Avrohom Charitonov . his son R’ Aharon changed the begining, to a slower, more chabad-style niggun. regarding other niggunim, its very common, becho hashem chosisi is a bobover niggun, they sing the begining a bit different, the “tune of kesiva vachisama tova” (a vizhnitzer niggun thats possibly less than eighty years old) in chabad the begining is not usually sung. B’Kitzur, do some research, and you will see that its very often for niggunim to change, sometimes because people try to improve it, or people aren’t exact on the tenu’os.

aderba, its only one tenuah that is different

its kedai you do some research on niggunim, most chabad niggunim are slightly differennt versions of poilisher niggunim.

1) just because it has 2 parts that sound the similar doesn’t mean anything. (2 niggunim of tal Yasis are exactly the same in certain parts, but its 2 different songs, וכהנה רבות to anyone with a basic knowledge of niggunim)

2) there is no zeicher of the high part – the part he Rebbe starts from.

the only thing it means is that the reb leviks niggun was composed in the same spirit/style as niggunim of Talmidei habal shem tov, which fits very well into singing it by the alter Rebbe

Maskim, it’s not the same niggun. It only has one similar tenuah.

At best similar…

Geshuri.

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