Hi Stanley,
That's exactly right. As long as the EXOS image, partition, license, and stacking protocol match, you can plug it into the existing switch and do the actual stacking config from there.
The only additional change that may need to be done first is enabling stacking-support on any hardware that can be used for either stacking or user traffic (e.g., VIM4-40G4q on the X670V). This would need to be done first, before the switch can communicate with the rest of the stack.
-Brandon