cosmicfolklore - In my experience, there's a difference between tobacco stock aging in bales sitting in warehouses, and what happens in the tin. This effect is accentuated in mixtures of different families of leaf, because in addition to aging, you get what I've heard referred to as "melding" in the tin, as flavors from those different leaf types marry in complex ways. But what we're talking about here is a single-leaf tobacco offering, so the melding effect is likely far less pronounced.
I've not done a direct vertical taste test on tinned RR with a couple/few years of age on it, vs. freshly tinned RR, both from the same vintage. ...But I would expect a bit of a difference, given the anaerobic reactions which occur in the tin after a time. But I've not verified this, it's just an expectation on my part. Sounds like an interesting experiment!