It sounds the same.
All amps will sound the same as long as they have sufficient power, ruler flat frequency response, low noise & THD, low output impedance, and low crosstalk/high channel separation.
I think they will differ in build quality, fit & finish, and GAIN.
I think the voltage gain is where all the perceived differences occur. If amp A sounds lower in volume (lower gain) than amp B, the impression is that amp B (higher gain) sounds BETTER than amp A. But if we were to volume match the amps, they would sound identical.
Verdict: the Acurus amps have HIGHER GAINS than the MPS-2. Thus, the volume output for the MPS-2 is a little lower than the Acurus. However, after increasing the volume of the RL-11 preamp by 1 or 2 dB, both the MPS-2 and Acurus amps sounded IDENTICAL: NEUTRAL and GREAT.