Both are the same power supply. The Model number (HKA30048063-7D which means 300W, 48V 6.3A) is the same, the input current is the same. The actual output power is the same. I think it's a little dishonest/misleading to state that the second PS provides 10A(max), people may believe this is a 480W power supply.
The real question is , do we really need all that power? With the 4Vrms input signal we provide at -12dBFS or even -14dBFS attenuation(x0.2 to x0.25) , and the total amplifier gain of 20.5dB or x10.6, the output voltage the amp can produce is 4V x0.20 x10.5= 8.4V, at 4Ohm we have 8.4^2 / 4= 17.64W
This means that a 8.4V DC/0.707 = 12V DC Power supply with 2A is more than capable of providing power for this particular use case. This is in "theory" because we know the TPA3255 needs at least 18V and 10.8V for the other digital circuitry:
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