Sharp and Round comparison. [Risolto]

Hi there.

What's the most noticeable thing for these coins for the Sharp and Round edges?

I tried comparing coins that are only sharp and only Round, but not sure what I'm looking for.

Currently stuck with 1941/48/49 dates having both.

Any advice will help me to continue ticking these off.

Kind regards.

It may not be very obvious on worn coins :

Ah, I just about see the difference, that's very tough to see. Thank you for the help!