I recently purchased "Second Winter" on Speakers Corner in honor of Johnny.
In comparison to my well worn but still great sounding 1A copy, the original is more open, wider soundstage, more bloom/air. Sonically speaking, they are both very similar however. The addition of three songs on side 4 (speakers corner) cut at 45 rpm are welcome. The only difference I can hear is greater emphasis on the bass guitar and drums. This record has easily identifiable bass guitar.
I consider Johnny Winter the blues equivalent to Jimi Hendrix. What an excellent master of the guitar and his ability to express the meaning of the songs he played!