I use to use a plugin to do this but it no longer works in the current version of Sketch.
This seems like it should be a standard feature in Sketch to help keep design systems nice and tidy. Is there currently a way of doing this I don’t know about?
I’m unsure if it’s been updated recently, have you used it?
Sketch needs to include this as a native function I think, it would be really really useful.
I do prefer another plugin called “Symbol Swapper” that I do prefer because I have more control of what I merge, however it’s sadly broken since latest Sketch Release.