2nd Gen [Help] Pokemon Silver Real or Fake

After some research I finally got a good price for a Pokemon Silver:



The Blue Version seems pretty fake, but the Silver one got me thinking.

I found some references for the USA Version and the AUS Version:



The USA Version has a GS logo next to Lugia's head, and the Nintendo Seal is a bit squeezed.
The AUS Version lack the GS logo, and has a rounded Nintendo Seal

The cartridge I'm trying to buy seems to be a AUS Version, so my questions are:
Are these differences just due to cartridges being from different countries and if so,
Am I buying an authentic AUS Silver?
Also, there's the chance the Blue one got it's sticker replaced, any tips for identifying it?

Thanks in advance (:

Countries also by date of release, I remember I had two different yet original Silver Version, both had different Artbox, don't worry at all!!
The Blue one looks ligit to me btw.