I fly intermediate in Pattern and Sporstman in Imac and agree that yes, the schedules are not the same, but the skills required to fly them well are.
The comparison with Dressage and Polo is not valid. A fair comparison would be between Formula 1 and Indy Cars.

Both Pattern and Imac required disciple and lots of practice in order to succeed. A good Imac pilot can succeed in Patterna nd vice-versa. Just look to Jason, Chip, Quique, Sczur, Christophe for confirmation.