Can the mosfet version be tweaked to sound like the tube version more effectively than the tube version can be tweaked to sound like the mosfet version? Or vice versa?
Difficult to say...
In my ears the M is more natural, neutral sounding than the T which adds quite some character to the tone.
The T tends to sound quite dark, and you really have to push the gain and treble on the amp to get it sound more fresh and to really get the highs open up.
But then again it offers some serious push and punch in the lower registers, I'm not sure if you can get them sound like the other one with their respective onboard EQ.
I would say the M is more versatile and lifely, while the T is more on the smooth side with more "ooomph".
IMHO if you are playing "fast" music, be it Rock, Funk, Metal etc. the M might be the one to go to, if your playstyle is more on the slow side, laying massive foundations with weight to every single note played, the T may suit better.
That's not saying you cannot do everything with either of them, it's more like a tendency.
That said, this is all from my memory as I'm not playing the Veyrons anymore.
I switched to the Behringer BX2000H which has the same power section as the Veyrons (Bugera is just another brand of Music Group Corp. which was founded by Uli Behringer), but I like its EQ section more than both of the Veyrons, giving you 5-band-EQ as opposed to 3-band, a frequency variable Shape Filter and some more.
All set flat the Behringer sounds pretty much like the Veyron M.
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