Is all 220 appliance cable the same?

I have someone with a tanning bed that was hardwired in the previous home. To make things simpler for them, I'd like to just take a dryer pigtail and wire it up for them instead. I don't know much about 220, but the current cabling is 10/2 nm-b with ground, 600v.

Are those appliance pigtails like what you'd see on a dryer the same? Or, are there important variances in cable type?

Is there any sort of max length recommendations or standards on 220 appliances?

Thanks

Edit: added pictures