Dark matter is an infinite number of free variables we can place anywhere in our universe to make our current gravitational models work. Of course they match.
Can you call it an observation if the lens you are using may be faulty?
Why is dark matter given so much precedence over model error? (Particularly because we know our current model can't do things like quantum gravity)
We see many datapoints gatheredbl by multiple technologies and approaches, but they all use the same cosmological model. The same lens.
Maybe lens was the wrong word. All the data gathered is interpretated using the same brain.