To be honest, for a single bowl, there's no need to be too formal about it! For example, the same singing bowl evaluated by a tuner with the note D at 440 Hz will give (with the same tuner) a D# at 432 Hz. We just change the calibration, but it's still the same quartz instrument. However, for a set of crystal bowls, it's quite different! The A note of the 3rd octave (standard note) being tuned at 432 Hz means all the other notes will be tuned at 432. And there will be a real difference with lighter, more airy intervals because they are slightly sharper.
The Immaculate crystal bowls, at 432 Hz, will therefore be slightly sharper by almost 1/2 tone.
Read the blog article on the subject
In summary, unless you are a musician or convinced that the 432 Hz frequency is the best, the ESSENTIAL THING IS THE CRYSTALLINE ENERGY. It is what purifies, clarifies, or elevates the vibratory rate of the Living. The rest is a matter of personal affinity and stock.