I guess I'm not very good with music. These all sound basically the same as the originals to me.
As a musician, the difference is glaring, but my ear (or brain, to be more accurate) has been trained by 2 decades of playing and composing music.
When I'm listening to music, and it shifts between minor and major modes, I can tell right away.
I suspect the cause is that there are emotional cues in the human voice, and even changing from minor to major doesn't alter those emotional cues. Also, prior expectations can dull the perception of difference.
TBH, I was surprised at how similar the major mode versions of those pieces sounded to the originals.