28" balance identification
Thanks for writing in! I do believe the S395-28 is the correct replacement for your balances. Given that your shoe depth is over 1", it is likely that it has just been worn down due to wear and tear.
The stamps on the balance denote the weight range a particular balance shoe be able to support. Since your stamp ratings differ from ours, I cannot be sure of their exact weight range. That being said, I would suggest replacing both balances at once; especially since the stamps differ from one another.
You'll need to select the 2740 stamp option which will support a sash weighing 19 to 26lbs.
I'm happy to help! Please don't hesitate to reach out with any other hardware repairs you might have.
Have a great day!