Ok, if you consider bitcoin as a "different design" of bmoney and hashcash. To me, a new design means a different way of achieving roughly the same specification. Since bitcoin solved the byzantine generals problem there is a huge leap - I would not call that a new design but a whole new paradigm.

What I meant was that the design parameters (finite supply, exact amount, halving time, difficulty adjustment mechanism, blockchain details like the merkle tree) are all still in place as laid out in the white paper