Constantine I The Great (Constantinople Founds) Patina Question

The patina on all photo's looks the same to me. Maybe the image was taken differently? Scan versus photo?

Seller's white balance was off. Maybe using a fluorescent lamp?

Photographing ancients can be a real challenge. I usually use incandescent lamps and a hand held camera is a must for most bronze coins.
Silver is much easier to photograph.
In order to create a reasonable amount of contrast I will often apply a dab of Blue Ribbon coin preservative and gently blot away any excess.
It gives the coins a bit of a "wet" look but makes it much easier to capture the details that otherwise are obscured by darkness. Some bronze coins would otherwise look more like a droplet of mud !
A quick acetone bath removes any traces.
If you ever suspect a coin to be 'doctored' an acetone bath is the surest way to unmask any deceit. It won't harm your coins and will leave them quite literally "bone dry" !

PS
Always use a glass jar or porceline cup when using acetone or you might actually melt a plastic container !
Also extinguish any flames
Highly volatile
I nearly lost my eyebrows once while working on a small lapping machine ......
Back in the bad old days !