Dual Y Axis Stepper Motor set up

As a complete newbe, I have questions on driving 2 Stepper motors with one driver. I understand one field must be switched in order to drive the same direction, but my concern is what voltage and amperage issues arise when driving both with one driver. Voltage is divided which would cause the Amps to double... Can the drivers on a Replicape handle two motors??

Thank you for your consideration
RBuster