ZR800 or M/Cat 900

Which CDI box has a hotter timing curve in the mid range ?
A ZR800 low altitude box or the M/Cat 900 Box ?
I understand the M/Cat box has the same timing as a ZR900 untill 6500rpm. Thats when the timing advances 2.5 degrees.
The ZR800 CDI is hotter throughout the complete curve then the ZR900 box.
I'm I correct with this observation ?

I understand the M/C box is the same timing as the zr9 until 6000rpm. That is when the box advances 2.5 degrees more than the ZR9 box. The M/C box would have less advance on the lower end the a ZR800 box. That means the M/C box is a better box to run w/twin pipes @ 500'/1000' elevations
Can anyone confirm ?
Mtn Cat 900
1800-26*
2000-26*
3000-26*
5000-21*
5500-19*
6000-17*
6500-13*
7000-12.5*
8500-12.5*

ZR900 same to 6000 rpm
6500-12*
7000-10*
8500-10*