No, when Gaga is #1 in some markets, it's because she sells like 1 or 2 copies more than Roar.
Katy has the US, Canada, Australia, Mexico, NZ, she is #2 in Germany when Gaga is #4.
Gaga is #3 in France and Katy is #4 (surprising since Gaga is supposed to be way bigger than her in France, Gaga was #1 yesterday and she already fell when Katy was "only" #3 2 days ago
).
Let's not forget that Roar is not released in the UK and that it is slaying with the pre-orders.
Gaga is already #4 there and completely falling.