I just looked at ADD on this site "The main features of attention deficit disorder (or ADHD) are inattention, hyperactivity, and impulsivity." Those are not the main symptoms of mania which are:

• Inflated self-esteem or grandiosity
• Decreased need for sleep (e.g., one feels rested after only 3 hours of sleep)
• More talkative than usual or pressure to keep talking
• Flight of ideas or subjective experience that thoughts are racing
• Attention is easily drawn to unimportant or irrelevant items
• Increase in goal-directed activity (either socially, at work or school, or sexually) or psychomotor agitation
• Excessive involvement in pleasurable activities that have a high potential for painful consequences (e.g., engaging in unrestrained buying sprees, sexual indiscretions, or foolish business investments)

The only thing similar is inattention in ADD and distractibility in bipolar, which actually are not the same.