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OAL and COAL are generally considered the same thing; (Cartridge OAL is the same thing as Over-All Length). There is no standard name for 'comparitor' length. Case length is case length, there's no other name for it.
Of more significance is your photo method of measureing bullet run-out at the case mouth is mostly going to measure your bullet's roundness and that will usually be quite good. For a much better indication of what you want to know, put the tip of the dial indictor as near the meplat as you can get while staying on the jacket.
No one ever knows what Guffy's really talking about, mostly it's just talk.
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