I think they can be treated as totally separate entities.
I am motivated to do well in organic chemistry, but I am not passionate about it. I am motivated about it because I know I need to do well to get my degree. But, I’m not passionate about my degree. I’m not really passionate about anything, to be honest (It’s a problem, I know) . But, I’d say I’m a highly motivated person, just because I get satisfaction out of doing something well.