I watched BG as a kid, but I never noticed any similarities between it and Star Wars except for your typical stuff that every sci-fi has, space ships, ray guns, aliens etc. That's like saying "Saving Private Ryan" and "Terms of Endearment" are very similer because they are set on Earth, both have people in it, and some of the people die.
Although I guess if you never had any contact with Sci-Fi before SW and then started watching BG you might think they were similer. So I guess it depends on your perspective.