Weight Variation Of An Imperial Sestertius

On screen, the both look OK, to my eye.
but
I cannot dismiss the possibility with both obverse and reverse dies matching, that they are both fakes.
Checks are necessary looking for matches on fake data bases.

What are their (separate) provenances?

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I have seen a fake Claudius sestertius, only judged as fake because of low weight - approximately 18 grams, otherwise looks to be perfectly OK with close hand held examination.

I think in this case there is no question about their authenticity
I have wondered about this same question myself although not about them being die matches to boot !
Several times I have acquired small groups of sestertii that by their very similar looking state of preservation very likely came from the same find
The weights usually were in a fairly narrow +-1 grams
This was true when the "mean" was 20 or 24 or 28 grams
My own theory is that it may have actually depended on the intended Roman audience
The Æ sestertius while impressive in size was only a token whose metal value didn't account for its economic prowess
The Roman money supply was essentially fed by the State making its payroll (military and civilian) and by the purchases of commodities and services used by the Army and the State
The VIP's almost certainly were paid in loftier denominations
I seriously doubt the 1% crowd soiled their hands very much with bronze coin
Their wine tabs alone might have been in the millions
(try carrying that around in bronze !)
If expenses were high or the mint operations low on enough raw materials to produce the necessary coins it would seem reasonable to skimp on weights of the bronze
A sestertius still being a sestertius and an As still an As
An eleven gram spread does seem somewhat outrageous
But one may have been intended for the elite "guards" payroll
and the other for some local contractors hired to maintain the military outhouses