I actually just did a test, using my Iphone and a sound analyzer software.
I used 2 different ball brands and the results are similar.
Stiga Clipper Wood: ~1250 Hz
Andro Treiber CI/OFF: ~1460 Hz!
A friend's Stiga Carbonado 190: ~1380 Hz.
I wonder how's that possibile? The Treiber CI/OFF faster than the Carbonado 190?
That might be possible, as I've said consistency and wood manufacturing/design sometimes bring surprises. Being a musician since a very young age, and having bought custom instruments made for me many times, and also comparing our views and feelings with other musicians and friends, and of course luthiers, there are of course some guidelines to get the right instruments, but there are surprises also.
When you get a custom blade supposed to be at least 1250 Hz that is only 1170 after 2 months of use after receiving it, that's a "surprise". Marcus Miller has been buying in the last decade dozens of 1975 to 1978 Fender Jazz Basses with ash bodies and maple necks to get only 2 or 3 that would match the tone of the one he plays since 45 years !
EDIT: and believe it or not, brokenball will correct me if I'm wrong, but even in electronics you can get some inconsistencies. There are 2 notorious NYC pro jazz bassists I know who have been influencing the secondhand market for a single effect pedal: the BOSS OC-2.
There have been multiple iterations of that pedals made in Japan until 1986, and then in Taïwan. The Made In Japan is supposed to be better, but still... those two guys have found that the MIJ era OC-2s had differences in tone between them ! still... after giving some of them to the 3Leaf Audio guru boutique pedals maker for further inspections, Spencer Doren found nothing different with the PCB, wiring or even components ! the only differences he noticed were the components being different with the Made In Taïwan ones. But he agreed that some of the MIJ pedals sometimes sounded "surprising" ...