The difference in Maestro versus Maestro II is in the dielectric according to SW - you might want to confirm with SW regarding the Crescendo but I suspect it is the same. SW still makes good and underrated cables.
I listened to some SW cables around 2012, red jacketed, lower models in the chain. Anyway, these cables sounded very good and were relatively inexpensive.
I use Crescendo III in my system and like them very much. What is the context of your question? Are you considering changing from Crescendo to Crescendo II or trying to decide if the price difference between the two is worth it?
The biggest difference is in the inner core design. My understanding is that the II was an improvement over the original in both dynamics and detail.
The II also supposedly more flexible than the original (it is one seriously thick and stiff cable), but can't imagine that it makes that much of a difference since the III is still like wrestling a boa constrictor sometimes.
The original is a fine cable, but I'd go with the II if given an option.
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