That's interesting. You've mentioned the possible effect of vibrations in the room and the functioning of the turntable as a possible (and also very interesting and plausible) explanation.
You could test this by doing a rip with the speakers playing loudly during the rip. Then you could test whether there's an audible difference between the rip and live LP playback.
I could certainly try that and it would be an interesting experiment.
However, it would sort of defeat the purpose of why I rip to digital in the first place.
I don't rip vinyl to digital to archive content, or to save wear and tear on LPs by listening to vinyl rips instead of the actual LPs.
I rip to digital so I can do A/B listening comparisons between carts in my collection, which is pain to do with live LP listening given the short length of acoustic memory and the time it takes to put on a new headshell, rebalance the arm, adjust the loading, etc.
My hypothesis in this method was to remove as many variables as possible, including the room, so I could just focus on differences between carts. This has allowed me to test a lot of internet claims that seemed like dubious hyperbole.
Example: AT-OC9ML/II and AT33PTG/II use the same MicroLine stylus, both have a boron cantilever. Impedance is 12 ohm vs 10 ohm. Both have a nude square shank. They're priced within about $80 of each other. Compliance are 9 vs 10 cu at 100 Hz. The bodies are different, though.
Given the common parts, same manufacturer, similar pricing, and incredibly similar spec sheets, I would find it surprising if there was a radical sound difference, unless AT voiced them differently on purpose.
And yet the internet is full of 'OMG the heavens opened up it's such a huge upgrade to move from one to the other, I could hear things I've never heard before in my life, my daughter/wife walked into the room and said it was just like the musicians were in the room."
In my system?*** They're really, really damn similar, according to comparing the vinyl rips. And doing the comparison via digital rips helps me avoid placebo effects. There are subtle differences, but they're so small I'm not even really sure which I prefer, which means if I have to listen that hard, I should pick between them based on some other criteria -- which one looks cooler, or has better resale value, or likes a lower tracking force, etc.
***(The classic audiophile response to this is "Your system isn't resolving or expensive enough to hear the differences and / or your hearing sucks and / or your listening skills are terrible." I could respond like a gear slut and point out how technically awesome the Devialet 400 is at both RIAA and digital. Or I could just respond with, "GTFO. My gear, my room, my ears -- it's the only scenario that matters to me.")
So, yes, I could do the experiment....but for what purpose?
For science?