First, this is an expansion, it requires a copy of The Resistance to play.
That said there is no practical way to ensure that every print run (and there have been many of The Resistance) is the exact same. So I am sure that there will be some card print differences between these expansions and your copy of The Resistance. That will be true of the smaller box, 1st edition and likely with different print runs of the 2nd edition.
In most cases I would suggest opaque backed card sleeves to hide those differences.
There are some card differences for the 1st edition (small box) edition of The Resistance:
Trapper Module - uses an extra team token, which in the first edition was a card.
Trapper Module - uses an extra set of Mission Cards, so there is some compatibility issues wwhen playing with the 1st edition and 8 or more players.