When to probe xyz?

If I probe x y z on clearing pass with a 1/8" bit. Then pass 2 is the detail pass with a 60⁰ 1/4" bit. Do i just probe just z or x y z again for pass 2?

Just Z. X and Y are still centered, but the height from surface to bit has changed.

Thanks. Having a brain fart this morning. Appreciate it!