Felt would change the perceived sonic outcome of the use of the given isolation device.
If the change is enough to alter the characteristics enough for the individual involved, or not? That is the question.
All one can do is try. Try one, try the other and then try both at the same time, listening to the differences between the three states.
After the given switch is made, wait a few weeks or days and make a swap or change.
Our ear-brain, like our eyes, builds up the image over time. In this case, it is a sonic image, built up, over time.
Which is why a-b switching in audio is just plain wrong. It’s about the cumulative effect on subtleties, it’s not about the gross levels of anything.
Subtleties, all subtleties. And that takes time to realize. Exactly like that of intelligence, exactly akin to it neurologically, it’s a difference and time thing. Speed, rate, and breadth of cognition, as a differential between individuals.
Some can hear it in seconds, some can hear it only in days or weeks. Some can’t understand it at all. And probably never will.