Rhodes Chroma Polaris

Just got my mitts on a Chroma Polaris.  I also have an Oberheim Xpander.
Understanding that they both use the CEM3374 Dual VCO, the CEM3372
Signal Processor and the CEM3372 Filter/Mix/VCA,
I am wondering how much they will sound alike. 

I was kind of hoping that there would be enough other variables that
one is going to sound "ARPish" and the other a bit more "Oberheimy" by
some other means.
Obviously, I'd expect simple patches to sound pretty similar between
the two, but overall, what would you say??

Thanks,


Dylan