I'd say there's a difference between picking some colour and a fine-tuned palette as a whole.
However, the derivative property of a work is defined by several indicators, not in isolation but combination, colours is one clue among several to properly justify a case.
And there is a proportion of inspiration taken and work accomplished. It is silly to discredit a huge and fantastic work just because of some similarity of colour in some part of it; yet in a small and uninteresting one of which the choice of colours might be its only redeeming standout feature, that may bear mentioning by someone.
It should be given appreciation how difficult it is to really distinguish a work on small scale towards the purpose of it; there is just so much you can expect. However if there is a remaining opportunity for differentiation, making good on it shall be its glory, more than the miss its shame.
Then there is something to be said about manners when people make it a dedicated effort to provide for you. But also, it should be in relation of how much it matters to their benefit, and how much it matters to the goal and success of your work.
Not my business really, just some general thoughts.
