Rabbi Zalman Pinsker, Rabbi of Kherson - Are these two Shlomo Zalman Pinskers the same?

According to Chabadpedia (http://chabadpedia.co.il/index.php?title=%D7%96%D7%9C%D7%9E%D7%9F_%...) Rabbi Zalman Pinsker, Rabbi of Kherson should be a merge with Zalman Pinsker Epstein Can anyone confirm or refute this? Also, where does the name Epstein come from? According to the overview of Zalman Pinsker Epstein he was a study partner of the Baal Hatanya, but this is something the abovementioned article omits. So are they the same?