it was annoying to always switch Conversion Tools to not have Files from the other Project in my new Project and also to always "clear the Cache" with over 5000 Stored Files and reexporting them.
So how does it work?

SCS Project Base Path - should be Clear (differs from your used Project)
Everything other stays the same instead of:
Conversion Tools Path
Conversion Tools store all the Files you Packed already for your Mod in it's Cache.
Just Copy the Conversion Tools Folder, rename it - for Example: conversion_tools_2_8sc
And then Change it on your second Project - and make sure atm you copy the Tools Folder that nothing is in Cache. (just clear the cache one Time via Blender)
Why is this useful?
You can work now on 2 different Projects and you dont have to clear the Cache and Repack everything again.
If you have any Problems, just ask.
Cheers