Definitely two saxes present on both "A Different Blues" and "Stella By Starlight" - if it were tape print through, it would be just about the most amazing instance of Kairos ever witnessed (on tape, that is 😉)
On "Different Blues" the switch between soloists is around 2:59/3:00, pretty seamless; in "Stella By Starlight" it's clear in the opening theme that there are two players present, change of soloists is relaxed here, the first one ends around 4:11, the second begins around 4:16, and when they re-enter for the closing theme at 11:30 its very clear there's two again.
Both tracks (and all others but "Deuces Wild", which shows Stitt in a most Prez-ian mood, reminding me of Paul Quinichette quite a bit) can be streamed here:
https://sonny-stitt.bandcamp.com/album/boppin-in-baltimore-live-at-the-left-bank
The band intro is a few bars into "The Theme" - Stitt forgets the pianist's name, but then gives his own (after someone probably reminded him off-mic how the piano player is called).
As for Mickey Fields, that doesn't quite seem to match from what little I know of his ... i.e. this wonderful take on "Lover Man" sounds so much more muscular in more of a big-tone line (Hawkins, Griffin, what do I know) than what can be heard on the new release:
Some more - undated and bad quality mash-ups, but quite amazing (including a bit of flute on the first - that segment is "Angel Eyes", right?), shared by Fields' son - nice also to actually see people dancing. Not sure of the other tunes heard, though I think I know them all ... second one has "Harlem Nocturne" in as first part:
And one final one in better quality but much shorter (dated mid-80s):