Edge lettering/mint distinguishing

The photo to tell the types of 1991 coins apart is of a different coin altogether.

I don't think so. Why do you say that?

The color of my coin is like regular nickel, the photo in question is like brass, and that bevel on the edge is nothing like mine, which is a regular edge, perpendicular to obverse and reverse.  Is that some new AI photography effect?

As for how large the crosses, there's little chance of being sure, but that bevel… Is that a new effect to grow accustomed to, or a mistake?

If you mean THIS it's just warm lighting and a coin in a bowl to see the whole edge at once.

Like this:

One I took with this method:

Got it.  I had never seen that trick before.

Credit where credit is due. @Sjoelund 

I'm glad it's of some use, thanks.

I took the opportunity to adjust the colors etc

I'll make the CR now.