The difference between the two types of music is that it has different origins and styles, as well as different rhythms and structures.

1. Different origins and styles: Polka is a Czech folk dance, while march is a music genre used to accompany a procession.

2. Different rhythms and structures: The basic movement of polka consists of two steps, in two beats, with a lively and jumping rhythm, bright and smooth. The march has an obvious rhythm, a distinct melody, a square section structure, and often even-numbered beats.