The suspicion is that your MQA and non-MQA versions of same track are based on different recordings.I think your missing the point
My only interest is can I hear a difference in streamed quality from MQA to non MQA versions of the same track. And yes I can.
I have no practical use for doing A/B tests locally of files on the DAP with MQA or NON MQA versions because I only use MQA for online streaming because of the benefits it brings (streamed sound quality and associated file size)
For anything local I use FLAC or in Tidal terms "HiFi"
Only way to check could be that you stream a MQA song in an App like UApp where you deactivate the unfolding and listen against activated unfolding in same app (not sure though if UApp meanwhile supports unfolding up to same level as Mango or Tidal native app on DX300).
Easy way to deactivate unfolding in UApp is to deactivate Bitperfect mode.