What's the difference between an "eSIM" and a "Digital SIM"?

I thought that ESIM and Digital SIM were the same thing, to be distinguished from a physical SIM. However, my iPhone SE shows that I have an ESIM and a Digital SIM, and they have different IMEI numbers. In the past, I think I remember that this used to show a section for what it called a "Physical SIM" but I think that section was replaced with what now says "Digital SIM". This was after changing SIM cards, carriers, and updating the APN settings.