Hi Wheels, There is no definite Yes or No answer to that question....it depends.
I know a couple of kiters who use a North Bar on various different brands of kites with better results and the default bar....because the North bar is often better than your average bar anyways.
I also see bad mixes from time to time... The first thing to do is to compare the default bar type to the replacement bar type (see picture below). If it doesn't match, you're probably in for a bad mix to begin with, like mixing a 4 line SLE bar with a 4 Line Re-ride bar for example. If it does match then there would probably be no problems at all, but the only way to tell for sure would be to try both of them side by side. Being an experienced kiter would help in feeling/noticing differences. Maybe if you tell us what kind of mix you'd like to try we could help you better. Possibly someone else has done that already ?