i believe they are both late 18th century coins, the bottom a qian long tong bao and the top a boo yuwan. not 100%, going off two of the same (or very similar) that i have.
Might be Korean. I have a couple that I received from my uncle, years ago, and I think tht was the conclusion I came to when I did a little research. If so, I don't recall them hving much vlue....in the US anywys.