I am in need of some help. I have a Keling Technology Stepper motor model # KL23HM276-30-8B

I looked up the motor on the Keling website and found a potential replacement with the same model number except for the M in the 6 position. This letter did not exist on the model on their website. The rest of the number was identical. Does anyone know what the M is for, and will the model without the M be a direct replacement?

If not does anyone know where I can buy a direct replacement?

I appreciate the help.