I've just updated the FAQ entry to be a little more organized and specific about the speaker types:
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There are 4 different 4x12 MES cabinets represented in various products:
Kevin's 2001 Standard/OS slant 4x12
This cabinet is represented in the Free Demo library, and the 412 MES-ST.
Kevin's 2006 Standard/OS straight 4x12
This cabinet is represented in the Heavy Hitters Collection (HHC, coming very soon).
Justin's 2001 Traditional slant 4x12
This cabinet is represented in the 412 MES-TR.
Justin's 2008 Standard/OS straight 4x12
This cabinet is represented in the Justin York Collection (JYC), and the 412 MES-OS.
There are several different Mesa proprietary Vintage 30's represented in various products:
Kevin's 2001 70 Watt
This speaker is represented as the "V70" in the 412 MES-ST.
Kevin's 2006 70 Watt
This speaker is represented as the "V30" in the Heavy Hitters Collection 412 MES (coming very soon).
Kevin's 2012 60 Watt
This speaker is represented as the "V60" in the Free Demo/412 MES-ST, 412 MES-TR, and 412 MES-OS.
Justin's 2001 70 Watt
This speaker is represented as the "V70" in the 412 MES-TR.
Justin's 2008 70 Watts
This speaker grouping is represented as the 4 offerings in the MES-412 of the Justin York Collection (JYC), and the "BR" speaker from the JYC is also represented as the "V70" in the 412 MES-OS.
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Short of it is there are no direct redundancies in cab/speaker combination with exception to the JYC/412 MES-OS, but the one overlap of cab/speaker sees a completely different feature set.
I plan to do a straight Traditional, but it's not yet on the site and not what is included in the HHC.