Speaking Of 5 Kopecks From Catherine The Great....

I as well would prefer to keep the heavy one. Then again I would end up keeping both just because I love those coins.

The coins pictured here show minor wear in all of the normal places you go looking for wear, that is typical for them.

Most often they are found with a rich chocolate patina, and quite often the patination has a greasy feeling to the surface.

Both are nice.
They present a slight problem with storage. They need to go into 2 1/2 x 2 1/2's, be they Mylar cardboard, or Saflips.
That means you also need the 12 pocket 2 1/2 x 2 1/2 album pages.

Copper does funny things under bright lighting, sel; these both have that nice chocolate color you mention although the heavier coin is slightly darker than the other. They reside in Saflips as do all of my coins, boxed rather than in an album. Once I get drug into the date set I see as an inevitability, I'll explore an album solution.

So far, 81.44g is the heaviest weight I've ever heard mentioned for one; indeed, the only one over 80g. That's the one I'm keeping.