AFAIK the focus with Clone-A is to *clone* an Amiga 500; meaning aiming for absolute perfect reverse engineered chipset for *100%* SW compatibility. The focus with Natami OTOH is to reimplement and *improve* the chipset, which inevitably will mean breaking a certain amount of compatibility. So spec-wise the Clone-A *will be* an Amiga 500 (no ethernet, usb, pci, 256MB chipmem or whatever), while Natami will be something else. Different purposes, different goals.
I think thats correct. Didn't they show the CloneA chip replacements actually plugged into an A500 motherboard at some show where they had a contest to see if anyone could bring something that would run on the Amiga but not with the cloned chips?