Are these LEGO Star Wars bricks genuine or fake?
I can't find an official source for this statement, but with the exclusion of a few rarities like test bricks, and perhaps a few other cases, every piece of genuine LEGO will have the brand stamped on it somewhere.

You've taken photos of pieces together that clearly ought to have come from the same mold, where one displays the LEGO brand and the other does not. That seems like solid proof that you've purchased fake parts to me.

As an example of how similar clone bricks can be, here are some battle droids made by LEPIN: https://cheap-bricks.com/lepin-05025-star-wars-homing-spider-droid/



It's hard to see, but I can make out the © on the trigger of the stormtrooper's weapon.