You use the Datasheet for any points not updated in Chapter Approved. If for example Lascannons get changed in CA2019 for Astra Militarum Codex you’d use those points. This is as per the flowchart GW published, but with a little leeway applied as technically the Flowchart doesn’t cover PDF Datasheets - it’s fair to assume the same rules apply and they don’t sit in some special force field by virtue of publication method.
(Nothing says points are frozen in aspic aside from the rest of the faction as BCB claims. That’s simply an incorrect reading, in my view. If a faction has a weapon cost updated in the Codex it applies across that faction unless we’re told otherwise.)
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