Well, they both use webkit or blink for rendering, but I don't know how much of the actual chromium codebase is used. However that shouldn't actually matter, be

Well, they both use webkit or blink for rendering, but I don't know how much of the actual chromium codebase is used. However that shouldn't actually matter, because they both claim to focus on privacy (especially Brave), which means that they've presumably removed or disabled the data tracking code from Chromium... or just changed the API endpoints ;)