The past tense of march to the beat of a different drum is marched to the beat of a different drum.
The third-person singular simple present indicative form of march to the beat of a different drum is marches to the beat of a different drum.
The present participle of march to the beat of a different drum is marching to the beat of a different drum.
The past participle of march to the beat of a different drum is marched to the beat of a different drum.