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What's the difference between this two methods of "tap switching"? do they work the same?

schematic

simulate this circuit – Schematic created using CircuitLab

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    \$\begingroup\$ No they don't work the same. \$\endgroup\$ – Andy aka Dec 18 '19 at 10:06
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No, the circuits are not the same.

I removed the "fluff" (the rectifiers are irrelevant) and added labels.

schematic

simulate this circuit – Schematic created using CircuitLab

The top circuit can output 4 different voltages if the voltages across the separate windings are all different.

The bottom circuit can only output 3 different voltages, when S2b is in the "C" position, switch S2a does nothing.

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    \$\begingroup\$ +1 Even if A:B is 5V, B:C is 5V, C:D is 10V , then you can get 5, 10, 15, or 20V from the top circuit, but only 10, 10, 15, 20 from the bottom circuit. \$\endgroup\$ – Spehro Pefhany Dec 18 '19 at 10:55

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