No, they use the same underlying hardware.
The Bolder Cable Company and Red Wine Audio offer aftermarket modifications to the SB unit as well as alternate power supplies.
The stock power supply is non-linear. There is general consensus that a linear power supply sounds better on high end systems. In addition to the vendors listed previously, this thread has sources for 3rd party power supplies.
220 ohms (reference).
2.12 VRMS without aftermarket modifications (reference).
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