as you wish, Hydrion lists Ginger at 156gal and Fluffy at 80gal
@c1d1labs has a presence here, and may have a different opinion.
I recall at least six booths at MJBizcon in Vegas last year having machines with an essentially identical profile on the tangential drain and the the cooling jacket, along with the matt finish. My assumption is that they are all derived from the same base machine.
I’ll state again: rather than volume, I believe rotor diameter will give your potential buyers a better idea of what they’re looking at.