A KALA concert with 20 frets? Must be a long neck or something, my KALA tenor has only 18 frets and it is standard sized. What is the scale length of the KALA in question? I think 15 frets is standard on a concert with 12 up to the body (one octave) it sounds like you might be looking at a couple of tenors.
I was curious about this and here is what I found. A luthier would have the specs on scale length, etc. that would explain these variations.
My Jenny concert - 19 frets, 14 to the body
My Kala f-hole tenor - 18 frets, 14 to the body
My Pono tenor 19 frets 14 to the body
My Tenor neck fluke - 17 frets, 12 to the body
My KoAloha long neck soprano - 17 frets, 14 to the body
Internet search
HF-2 Kamaka Concert - 16 frets, 12 to the body
Oscar Schmidt OU2 Concert - 16 frets, 12 to the body
Ohana CK 10S/20S/35G-Concert 19 frets, 14 to the body
Oscar Schmidt OU250Bell - 21 frets, 14 to the body
In answer to the original post, more frets = higher notes.
I love my three, 12 fret and one, 14 fret sopranos as much as any of the longer neck/more fret ukes.
Regards,
Ray