SDSDQUAN is class 10 UHS -I and SDSQUAR is class 10 UHS - I and A1. A1 is an android Application performance class rating. If you plan of using the card in a Note 8 the A1 card would be best if you plan on running applications from the card.
G4A and GN6MA are packaging codes. They do not mean anything for the card itself.
The issue you describe for the other card sounds like it may be a a fake. You can contact sandisk support to check the authenticity.
