I'm not convinced that these vinyls would be sourced from something other than the CD.
- If the vinyls sound better in some cases, that could be because whoever remastered the transfer simply did a really good job at it.
- The high frequencies in the spectrum could be a side effect of the remastering (e.g., some kind of harmonising effect). Alternatively, it could be harmonic distortion introduced by the turntable or recording process. Since you can't explicitly listen to those frequencies, it's impossible to tell...
- If the vinyls sound better in some cases, that could be because whoever remastered the transfer simply did a really good job at it.
- The high frequencies in the spectrum could be a side effect of the remastering (e.g., some kind of harmonising effect). Alternatively, it could be harmonic distortion introduced by the turntable or recording process. Since you can't explicitly listen to those frequencies, it's impossible to tell...