I don’t understand why you have run them from different Cubase versions which leaves room for error in settings. Just switching the 64bit processing on or off in the same version is a fair test.
Honestly I’m not going to say there can’t be any difference using 64bit engine but saying the 64bit is suddenly “audiophile” or that there is “much more detail” is really overstating what is possible. Any difference should be incredibly subtle if not completely inaudible.
Otherwise you’re telling me we’ve all been using a crippled DAW all these years while other DAWs already had 64bit processing…I’m sure the reason Steinberg haven’t rushed to catch up is that they know it makes little to no difference to the final result.