Yes the thought experiment is meaningful based on the fact that they are the same. It serves to answer the question “why talk about qualia at all rather than just calling experiences sense data?”. Sense data is generally referred to with respect to a boundary, eg. a camera has sensors that perceive photons. And then there’s processing (eg. sensors’ electric signals are digitized and carried along).
If one can imagine keeping their sense data the same (input to eyes, and input from cones) yet switch the inner experience based on reworking the processing system, then the thing we’re talking about exists at the processing level and is not sense data, thus experience is not sense data.
I have a similar view as @Charbel-Raphaël that the ‘hard problem’ can be dissolved rather than solved. In that sense again I am an illusionist. It’s not easy to dissolve right now, because of how little we understand consciousness, but I believe that solving the mapping problem precisely will give us enough conceptual leverage to understand why the hard problem is nonsensical.