Single Pass Instancing vs MultiView, and how

I wanted to know if there is any actual differences between Single Pass Instancing(PC) and Multiview(Android). I’ve been trying to find ways to have some of my shaders take into account other view matrices for the DX11 BIRP since on PC not all headsets render in parallel, and I want to improve the end user’s performance especially for those wearing wider FOV headsets like the Pimax.

It’s basically the same.
If you look at Unity’s docs for single pass instanced it shows android with multiview as a supported platform.
I believe multiview is just the term used for the android driver feature