Controlling the input with step motor output

Can I duplicate the stepping motor control to a larger nema size stepping motor via using a second steper control. Can i use the first stepper contols output as and input to the 2nd stepper controller thats capable of driving a much larger nema size stepper motor. I have a laser thats rotary is a stepper motor but very small nema size. I want to run a much larger rotary which has a mu h larger stepper motor. The lasers stepping controller is built into its main board. Help. Thanks!

FIRST! You must determine exactly HOW the internal stepper is controlled and then you can see if any of the control signals can be used to control a standard Arduino type controller board.

What is controlling the laser stepper?

The Internal stepper controls straight off the main board of the laser. No prints

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