I never measured cylinder lengths for this just frame openings which are fairly consistent for every frame model (the J frame magnum frame is an exception to this by about .1).

J frame cylinders 38 + 357 cylinders have different lengths as do K frame 38 and 357 with the 357 longer. Only have 44 S in L frame. N frame cylinders vary for several reasons. The recessed cylinders are appox .060 longer just for recesses. 45 acp shorter for clips. Thats the recoil shield end. The barrel end has differences to. The 357 and 45 acp, 44 special and early 45 colt(-3 and prior) ones are considerably shorter than the 41, 44 and later 45 colt cylinders. The barrel to cylinder gap on these is taken care of by a considerably longer barrel extension. But it on measures from the center of the extractor to the face of the gas rig on front of cylinder the length there is very similar on all except for minor fit adjustments. Plus lots of small changes in dimension differences over time and models. A early 44 mag recessed cylinder I used to make a recessed 45 colt cylinder was not only .06 longer to rear for recesses, but also about .04 longer to the front than the stock 45 colt cylinder and I had to trim the barrel extension to fit it.