I think it really depends on how permeable the plastic bags really are.
If they are truly impermeable, then I would think that you would eventually kill any living organism due to lack of air exchange -- they will eventually use up their air supply (I assume by converting O2 to CO2 and H2O, but there will be nothing to convert the CO2 back to O2 because all of the tea plant's machinery is dead).
But, even things that seem air-tight may not actually be so in the long run. If that's the case, then they'd likely all become similar environments after some time, even if they started out differently. You wouldn't know until you opened them...
And, as MarshalN says, the humid ones will have a risk of molding before any of that happens, depending on how you do it.
That's all just a guess, though.
I've got a few "duplicate" items (mostly tuos) that I have some in my pumidor and others just outside in the room in order to do a similar comparison.