I recently showed a friend some ideas that I had for explaining some basic concepts in data analysis. He told me, quoting exactly, that he "showed some of it to my colleague and she says you've got a job if you want one!". Of course that's just friendly banter and not a formal job offer, but I appreciate the sentiment.
We all absorb and consolidate ideas from different sources, but I would be perturbed if a whole presentation of mine were to be shown to someone else without at least some acknowledgement.
There is a fine line between representing earlier research and re-presenting earlier research.
The hyphen is a fine line.