these are meaning same.. not differenf.. these uses to do emphasize. ( only there isn't in turkish kaz kere) kaz= goos. for instance : do you konw, I called you what times yesterday.. biliyormusun dün seni kaç defa aradım kaç kez kaç sefer

There is no difference between kez, kere or defa. You can change each of their places in the sentence you're building.

kaç kere