In Sketch, how different do the artboard sizes need to be so they DO NOT show up as replacement options? For example, I have some symbols that are 200px x 48px and when I want to replace them, I also see other symbols that are 190px x 50px. Does anyone know what the threshold is for Sketch to think they're not the same?
The symbols are normally managed by name. You can group the symbols by rename them as:
Then when you swapping symbols, you'll only see the 200px or 190px symbols in that group. Check the official document to learn more.