PowerShell version differences affect text output?

Question

PowerShell

What is the chance that the difference between the versions of PowerShell will let the old scripts work?

Answer 1

Depends on what these scripts have.
If you delve into the bowels of pwsh through reflection and get involved in some hidden undocumented features, then it will almost certainly break.
If you use something specific to Windows, and then switch to pwsh core on Linux, it will also break.
If you use third-party DLLs, then most likely it will also break when switching to pwsh 6/7.
In other cases, it shouldn't.