Pawnee and Kanza Pecan trees

I would like to add two pecan trees to my yard, but don't have a lot of room. It looks like Kanza and Pawnee will pollinate one another, is this correct? I've seen some conflicting information about the size of Pawnee as well, some places saying it stays under 30ft, but other say it gets up to 75ft like most pecans. I can have one large tree but not two.

Looking at the pecan pollination chart on the university of Georgia's website, there appears to be good overlap.

I also noted some "small" Kanzas for sale, I wondered if they are truly small or if it is on a dwarfing rootstock, which would be abnormal for pecans.