The other one is not a fender tag, even though it’s on that format. It went under the carpet on the drivers side in 1967 Hemi cars. I bought a gtx from and older man who owned it since the 70’s and I new the car and it was. Or any kind of a fake. She;I took the carpet out there was that tag. I was told by knowledgeable people that’s where the factory put it.
It was never under hood by the real fender tag.
I don’t know if 68 even had them or not. Many changes for 68 like the vIn moved to the dash, the certicard moved from the,under hood pouch to the owners manual, etc.