They aren't the same thing. Each layer answers a different reader question and lives on a different timescale. The same fact — say, what fulvic acid does — can appear in all four, phrased for four different moments.
Read top-to-bottom as increasing depth and commitment. The left bar darkens as you go deeper.
A reader can enter at any layer and travel deeper. Everything routes through the compendium entry — which points back out to the evidence, the voice, and the product.
Drawn from the Schematic lexicon (Meridian, Ledger, Vessel, Marginalia). Each shows a recommended name plus alternates.