i don't know which file work which not but i see 2 different
1. nc files the z top its 0.3937 while in tap file its 0.2
2. tap file you have in each time go to z the command S5903 i don't know what is this mean?
3. nc file height correction line its"G43 H103" while in tap its "G43 Z0.6 H1" why this z in the line?
Here's what I can clarify and answer,
1. The .nc file is generated by Sheetcam, the .tap files were generated by Fusion360 using their published post processors.
2. The Z axis on the machine has about 12" total travel and the stock is usually between 2-4" in height, so having retracts at that height are not a problem.
3. The tool used in Fusion for this sample had a spindle speed of 5093 RPM, so I suspect that is the Fusion post being very redundant and setting the spindle speed again.
4. I have no idea why there would be any tool height correction (G43) in the g-code for either the .nc or .tap files. I suspect that tap file is essentially saying move the tool up 0.6 inches plus the height listed in H1.
I'll admit to a moderate degree of uncertainty here, don't forget I'm about as competent on most of this as a reasonably clever hamster.