Omega Cal. 321 Balance Complete 320-1327 Variations

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hello OF,
Thanks to the generous minds here, I have learned that there are multiple variations of the 320-1327 balance complete.
From reading replies on other threads made by @Archer and others, I understand that using the wrong version can lead to timing issues.
Would anyone mind enlightening me further on the specifics on this?

is there a way to tell visually?

Is there a point/serial range in the 321 timeline that marks when the versions changed, and is it synonymous with other changes such as the asymmetrical vs symmetric coupling clutch?

I appreciate any information on this!
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