As an exercise for the perennially geeked, calculating the differences in capacitance, inductance should give a few seconds of mathematical bliss - at least.
intuitively, one would want as small a difference as possible (obviously), but a few CM aren’t going to change anything appreciably to anything but an oscilloscope. We’re not quite approaching Planck constants for time or length, but what human auditory perception and spatial orientation will define.
this does seem to be a hobby for Asperger’s syndromish fussbudgets, so, you do you, enjoy. Keep us posted on your results.