Same presentation topic for different conferences Is it possible to give the same presentation, e.g., invited talk, tutorials, and like (same topic, slight change in abstract and other parts) in different conferences? Is there any plagiarism issue like with papers?
It's entirely reasonable to give the same (or nearly the same) presentation for different audiences.  This frequently happens with invited talks, which are often expected to present a survey rather than a particular new result.  Thus, there is no expectation of novelty and thus no issue with plagiarism.

If you are presenting on a paper, on the other hand, the talk should be novel simply because it is about a paper that is novel.