Is there a size difference between the XS400 and XS650 Rear Calipers?

Yamaha XS650 Brake Caliper Set

Shane emailed us and wanted to know if there is a size difference between the XS400 and XS650 rear calipers.  He also asked if there is a big difference between the front and rear calipers.  And what is the measurement between centers of mounting holes?

Answer: There is a size difference between the XS400 and XS650 and the rear calipers have a completely different shape than the fronts.

The measurements from center hole to center hole is roughly 112mm.