Substituting stepper motors

The KL23H51-24-08B stepper motors offered by the RRRF are out of stock both there and from the manufacturer, so I was wondering if the KL23H256-21-8B, offered by the same manufacturer, is an acceptable substitute? What changes to the controller would I need to make?

Datasheet for alternate motor: [www.kelinginc.net]
Torque-speed curve for alternate motor: [www.kelinginc.net]

Datasheet for standard motor: [www.kelinginc.net]
Torque-speed curve for standard motor: [www.kelinginc.net]

Yeah, looks OK. It's a different length, but the Arduino stepper boards should cope with the lower resistance - careful when adjusting the trimmers on the stepper board though - you're in uncharted territory there.

Zach? Look good to you?

Vik :v)