How do you build your design system in Sketch app?

Question

Sketch

Good afternoon. I read a lot of articles on this topic, the general principle is clear - atomic design, creating symbols for everyone and everything, uploading them to the cloud, synchronizing and reusing them in different projects. But the question arises just about using the same symbols in different projects - let's say we have a formed UI kit (typography, buttons, inputs, etc.), with certain colors and design. We start a new project and take some element from there, but its style does not suit us. We change. After that, if the UI kit is synchronized via Craft, we will probably see a warning asking whether to update the element in the master file or not.
Do I understand correctly that the whole process of using existing components in a new project comes down to the fact that we take them from the master file, change them and NOT synchronize them, leaving the modified instance within the new project?
Please share your approach to organizing workflow and design systems.