I agree with 'Flatgate' sounds a bit like a "cop out" really,
in your question the "key word" is 'ANY", NO, NOT any cylinder will fit in ANY Single Six, they need to be "fitted" or at least be close enough in 'like model,vintage era, to possibly just "drop-in' ( yes seen it happen,BUT it shold still be checked out for proper fit & timing, hate see ANY one get hurt or injured.................
Yes, when the factory 'fitted' & shipped the guns with a "spare, extra & fitted" cylinder, they were marked on it, with the last 3 digits of the gun it was "
fit" to..........