I have always been told that matching only matters for the power (output) tubes but I think it would depend on how the circuit is done. I think the Aesthetix are balanced right? Maybe it can make a difference in that case. See if you hear a difference!
Do small preamp tubes 12ax7 need to be matched?
I had a Telefunken 12ax7 tube go out on me in the V4 (R) position of my Aesthetix Rhea, so I replaced the pair with stock Sovtek 12ax7WBs. Do I need to replace the Teles with a matched pair, or can I just pick up a single and throw it in. Obviously, I'll stick with smooth plate, as that is what was in there.