I measured the Yamaha yesterday. The span between the C and the E key one octave higher is close to 1/4" shorter than the PA60 and the Technics KN7000 at the local store.

Also, which doesn't make a difference in actual playing ability to me, is that the Korg PA60 has 1/4" shorter black keys. that measuring from the tip of the black key to the back of the key. I didn't check the white keys for length.

You can tell just by glancing back and forth from the PA to the other boards. I wonder who engineers this stuff.