I thought this might be helpful as you work with the assortment of scallop dies that go with the Stampin' Up! Big Shot die cutting machine.
The name on each scallop is the name of the die.
The 20 year embosslit die seems to match the SU! scallop circle punch.
A couple of my favorite layered combos:
Below: 2 scallops from the Birds & Blooms set on the SU! scallop punch:
SU! scallop punch layered on the scallop from the Pennant Bigz die: