The Gemmorah BM 85a:
"ר' זירא כי סליק לארעא דישראל יתיב מאה תעניתא
דלשתכח גמרא בבלאה מיניה כי היכי דלא נטרדיה"
"When Rabbi Zeira ascended from Babylonia to Eretz Yisrael, he fasted one hundred fasts so that he would forget the Babylonian Gemara, so that it would not hinder him from adapting to the unique style of study prevalent in Eretz Yisrael. "
Of course, the two Talmudim look different, the Babylonian describing much more arguments, stories, Agadetah etc, but How the Israeli tradition of learning was different from Babylonian to cause R' Zeirah to fast 100 fasts?