My feeling is that the SA 2nd class is indeed a fake. The eye is the main detail that gives it away. You'll notice that the eye-ball is open creating the double line effect. This is wrong. The 3 x 1st class are original. If you look at the eyes on the 1st class enamel versions, they have a dot for the eye which creates the 1-line effect. it's a small but significant detail that sends up red flags. Also, the enamel work on the 2nd class is concave and not flush with the silver framing details, due to shrinkage of the cold enamel when it hardened. This does not happen or does so only minimally on hot, glass enamel used on originals.
I think the Baltic Cross is ok and the Kartner-kreuz is ok, as well.