Yep! It's like a difference between spring boarding and plagiarism. Spring boarding has you take the basic idea of something and do something different with it, where plagiarism is just taking a large chunk of something and pretty just copying it.
while doing Homage sculpts is... really blurry on the lines, but using something as a starting point to develop your own thing is a much better 'spring board' approach. In a way, I would say Isaac Asimov's novel "Fantastic Voyage 2: Destination Brain" uses Fantastic Voyage as a spring board (basically.. Asimov did the novelisation of the film as Fantastic Voyage but he was never happy with it, partly cause of how much of the scientific details weren't good and he wasn't able to change it enough for his tastes. and he never felt it was his own cause, it wasn't. It was a Novelisation of a film script written by Harry Kleiner, based on the story by Otto Klement and Jerome Bixby (which itself was partly inspired by Richard Matheson's "The Shrinking Man". So later on, he had a change to write 'his' version. apart from miniaturized scientists entering a human body, there isn't that much in common. While it isn't the BEST novel ever done (Asimov was best as a short story writer) it's a great novel and really just used the original as a spring board. I think that's a good example of spring board vs plagiarism.
I think some Citadel Miniatures are a bit... boarder line to if they have used the source that 'inspired' them as a spring board or just plagiarism.