Yes. ADHD and Depression have characteristic similar to Bipolar 2.
My daughter was initial miss diagnosed in middle school by an experienced psychiatrist. Later her diagnosis was corrected. She is now 30, has a job she loves and no longer needs medication.
I too have ADHD and Depression. Once or twice an acquaintance has asked me if I’m bipolar.
I am comfortable with my diagnosis but when I hyperfocus or I’m excited about a project or doing something I enjoy, I feel a bit manic. It makes me understand why there is confusion.