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I noted his version corresponded to what I had already learned.
I was severely reprimanded, with his saying if I had told him that in the first place it would have saved him weeks of research.
Your story is not an uncommon way to confirm research on items that some times can be complex.
I usually leave out the part were the assisting expertise confirmed my own research, and give full credit to the one that helped me confirm or sent me on a better path.
It is an approach that has worked well for me, and it makes good people feel good about their good work. Lets call it being tactful
Christian IV(1588–1648) mounted on his horse with the riding sword posted further up in this post in hand: