Take it cool - nobody said the Mini didn't sound like a Recto. It just sounds like a little different kind of Recto. 8)
You asked which big Recto sounded the same, and none does.
As for the revisions, the serial number will give you a good idea. But the only sure way to know the revision of a 2-channel Rec is to check the circuit board for the printed code near the four big blue caps, e.g. "RF-1F" (which means it is Revision F). It has happened in the past that inside the shell of a serial < 500 Rec there was a Revision G board - possibly because the original had been damaged beyond repair and Mesa was shipping Revision G boards at the time of the repair.
For the two versions of 3-channel Recs, the first series says Solo Head on the front panel, the Reborns say 100W Head.
The Road King series 1 says Road King, RKII says Road King II. Simple enough.
As for the differences, they are sometimes exaggerated on forums, especially by people who want to give the idea that their less common revision is the bee's knees and significantly different (better) than everything else. You could argue that the "pre 500" revisions actually are that different, but then you'd have to keep in mind that they also lack the signature Recto tone and have terrible cleans.
Here's my personal take, YMMV:
Revisions C, D, E:
The "pre 500" versions. (Technically, Rev E should be called a "pre 600", but it does have certain similarities to C and D.) These early revisions had more in common with the Soldano SLO, from which they inherited a lot. Much brighter and especially much tighter than the more familiar Rectos. The D was slightly less bright thant the C, and the E is a sort of transitional model between the D and the F. Out of the box, the best metal and shredding amps Mesa ever made (IMHO) but they also had their drawbacks. If not dialed carefully, they could sound thin and brittle (especially the C), and the cleans were kind of stiff and cold. And they simply lacked the trademark 'Recto tone'.
Revision F:
The first Recto that actually sounded like a Recto. They are still more aggressive and brighter than the regular Recto tone but their gain structure is much looser than the pre 500 models, especially on the later F's that no longer used Mark III transformers. The clean sound is ok.
Revision G:
This is the iconic Recto sound of the 1990s. Darker, warmer and more massive sounding than the F. The clean sound is good but not crystal clean.
3-Channel Dual Rectifier (series 1):
Brighter and more aggressive than the G, also more 'metal' sounding. The usual complaints are that this model is also colder and 'fizzier'. Uninspiring clean sounds.
'Reborn' 3ch Dual Rectifier:
Brighter still but the gain structure is still rather loose. Clean sounds much improved.
And after all that has been said...
I currently have 3 Rectifiers, and I have to say that the one I love playing the most is the Rev G. Not just for the obvious styles but for anything that requires any Gain - just a little Gain, moderate Gain, or lots of it. Like Hendrix, AC/DC, ZZ Top, you name it, it just rules. Rich, warm rock tones. Of course it won't be 100% match to those tones but it is sheer enjoyment to play. The amp delivers. It almost plays itself.
The Rev C is my tool of choice if I want something specifically more "hot-rodded Marshall" sounding or when the word "metal" is involved.
The Road King II...is the King. And yes, it can do just about everything you can think of. In theory. In practice, I find I'm spending more time dialing it than playing it. And never quite nail the tone I'm hearing in my mind. For example, I can dial the perfect "monster JCM800 from hell" tone at home, then take the amp to our rehearsal room and all I hear there (with the band) is fizz and whine. Also, compared to the 2-channel Recs, the RKII is a much more modern sounding and feeling amp, in the not-so-flattering sense: colder, less organic, more processed-sounding (but this applies to all modern 3 and 4 channels Recs IMO).