Sample/Rip off. Fine line betwixt the twain imho. I wonder if Mick & Keef got paid out for the original orchestral version too? Not as if they aren't shy of a few sheckles between them. If I haven't already said so on a previous fred Keith Richard's autobiography Happy is a fantastic read. Not sure on the accuracy of it though as he spent the best part of it off his tits on heroin and I doubt he kept a diary!
On the subject of plagiarism in music: there are only 7 notes! Even if you combine all of them with another that's only 42. Add a third we are up to 210. At a guess I'd estimate that only a quarter of combinations work so that gives you 52/53 possibilities. There must have been many more than 50 odd songs created so some are bound to use the same notes as others.
I preferred Pot Rice as there was no waiting for the contents to soften, stir it up and start eating. The "beef" curry was restaurant standard.