It can be said that IE mode on Edge is Internet Explorer

Hello,
I have problem want to reference.
We have a blazor application that requires Edge Chromium to run.
In IE mode, my project does not work. Although I know Blazor webassugging does not support IE and Blazor Server needs polyfill.
My question is is there a difference between IE mode on Edge and Internet Explorer in supported platforms?
Can I say IE mode on Edge is IE?
If possible please give me documents about this or documents saying that IE mode does not support Blazor.
Best Regrad.