If the output impedance of the amp is a few ohms (~ 1 or 2) and the frequency response is flat from 20 Hz to 20 kHz, then they all should sound the same.
ANYONE WHO SAYS THAT THEY CAN HEAR DETAIL, SOUNDSTAGE, WARMTH, COLD, ETC. WITH A PARTICULAR AMP IS BUL#SH#TTING
Sir, Do you have a degree in any STEM field?