I say they're both fake.
The Demjansk is very crude with pitting on the obverse, with soft details. The paper backing and rubber stamp is not a sign of an original.
The Krim looks like it's been cut from a piece of sheet metal, check the uneven edges. The reverse fixing is also wrong. I believe only one maker used the wrap around tabs and they look nothing like this.
Looking for LDO marked EK2s and items relating to U-406.....
I agree,these are both fakes unfortunatly.The Krim sheild looks very poor quality and the Demjansk does'nt even appear to be made of the correct type of metal and as for that stamp on the paper backing,well that is a first for me!
Thank you very much both of you for the detailed answers !!
both horrible fakes