I’m not too familiar with the Nomad workflow but I think you should be able to do that.
- if the machine disconnected before the tool change probing happened or was taken into account, you may still have the zeroes from the first tool, and then you could force a tool change again from CM, to adjust Z zero to the new tool, and proceed ?
- if the machine disconnected after the tool change was properly taken into account, you should be able to just proceed
I would first jog manually to 0,0,0 and check at least visually if it looks like your zeroes are still in the right place. Since you probably milled off the top surface that will not be a very precise assessment, but if your roughing and finishing tools have significantly different stickout/length, it could be enough to confirm whether you still have the “first” zeores or if Z zero was adjusted for the second tool. You could also jog to somewhere else on the piece that is still there and that you know the thickness of / height from Z zero, to check you are at the right Z offset?