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If you connect two together, they output from one could be pulsing when the output from the other is off, forcing voltage into the off one (damaging it).
1) Feedback. SMPS watch the voltage on the output to tell it if it needs to have more or less voltage (ie make a pulse or not). If there is another power supply connected, it will not respond to feedback as it was designed to - if the voltage is too high, turning off the 'pulses' will have no effect. This means one power supply is very likley to shutdown (or both).
2) Current sharing. Whichever supply has a slightly higher voltage will take all the load (and if the load is too high, it will damage the SMPS). The power supplies will not equally share the current demand of the circuit - instead one will go into runaway mode, taking it all. If that one then shuts down from current overload, all the current will suddenly be dumped on the second one, which will also then have to pump current into the other, now shutdown power supply