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Would these be considered GFC? I read somewhere that GFC can only be from a PC. These are not from a PC. If they are not GFC, would they be Hi Perph? and if yes, would removing the gold fingers downgrade them?

First not all GFC comes from PCs. That is the most common place to see the type of fingers that make the grade, but similar or the same sockets are used in other applications and the fingers that plug into them are GFC type fingers. So yes these are GFC.
However, in many of these applications the card itself is a higher grade card. You have at least one such card here. Leave the fingers and removed the final bits of steel from the card that has the green steel pin sockets and I would put this card in one of my high telco shipments (the fingers add to the value so cutting them would probably drop the card to high periph). The other card is a little trickier, probably can't quite make high telco. I would put in GFC.
As an aside there is an exception based on size and junk weight. Some motherboards have gold fingers, but they are still just motherboards, you can cut those fingers without downgrade. Some mid-grade boards from high end network equipment and other very old equipment have gold fingers, but again they don't go as GFC.