Ancient Roman coin identification

Got this coin, dimension is 24mm on longer sides, and 22.4 on squashed sides

Feels real heavy, terrible shape, but not worst I have seen. Can anyone ID It?

Okay so, I have one other coin similar to that one in color. Now I have been researching how to tell bronze and brass from gold. All results say brass is magnetic, and bronze is harder than gold. So I took a key from my pocket, and pressed onto each coin, (Don't give me grief, they are terrible shape as is) The coins indented fairly easily for how much pressure I put on them, but that doesn't mean that I didn't apply enough to indent a bronze coin too. The color looks gold-ish, but they are so worn I can't tell, and I have never owned any gold coins. Here is the next one, it has a left facing bust, and a cross type deal on back. It is 14.7mm  on smallest side, and 16.4mm on largest side.

I am awaiting a scale so I can do a density test with water, but until then Idk how to tell if they even look right for gold. Thanks@!

There is no way gold can be in this shape; gold does not corrode, not to mention brass is not magnetic.

Small coin is ID'D

405 B.C. syracuse sicily hemilitron bronze, bust of Arethusa.