Is it possible to start an application with .Net Framework 4.8 on the system with only 4.6 .Net Framework?

Question

We've updated our app from 4.6 to 4.8. After some tests I figured out that on the system with only 4.7.1 Framework installed our app starts flawless. However we have no machine with only 4.6 Framework and I have 2 questions:

1. Can the app compiled with 4.8 be started on 4.6 (without any changes in code)?
2. What happens than, if a method available only on 4.8 will be called on the system with lower framework?

Answer 1

This guide details changes between .NET Framework 4.6 and 4.8, so if your project uses anything specified on this guide, the application will throw an exception.

Otherwise, it should work I guess ?