paulz, I did not see any references to color and type as to old/new in the linked document either. Is the green stuff you are wondering about a more green-green or a more olive-green. Both the old CCA and some of the newer treatments use copper and that is where the green color comes from. The newer types don't have the arsenic or other heavy metals. The newer tend to be less green, more olive toned.
I believe the tans and browns are all going to be one of the newer types.
Both old and new come in different retention rates; above ground through foundation and salt water grades. And that is the big decider as to where it can be properly used.
Wood products treated with borates are available in both countries. However this is not an equivalent to CCA, as borate-treated wood may not be used outdoors exposed to rainwater (borate preservatives do not bond to wood as well as CCA, which means the preservative can eventually wash out and thus leave the wood unprotected). Borate-treated wood is well-suited to applications that are protected from exposure, like sill plates.
WHAT IS INCISING AND WHEN IS IT REQUIRED?
Incising is the process of cutting many small slits into the surface of a piece of wood in order to increase the amount of preservative taken up by the wood during treatment. Some wood species are particularly hard to treat, and incising is necessary to meet the penetration requirements in CSA standards. Non-incised CCA- treated wood will have a shorter service life than incised CCA-treated wood, but the difference may not be noticeable in the short term (under 20 years) in relatively low decay hazards such as decking. For wood in critical structural applications under conditions conducive to decay, incising could make the difference between 4
and >40 years service. Incising is not necessary with borate-treatment, because borate diffuses to achieve the required penetration. With borate-treated wood, there in no difference in performance between non-incised and incised, provided the target chemical content is achieved. There is a strength-loss penalty for incising, which is addressed during structural design.
WHAT'S THE DIFFERENCE BETWEEN GREEN AND BROWN TREATED WOOD?
If you are shopping for treated lumber at a do-it-yourself retail centre, you may be confused by the choices and store staffers may not know much more than you do. Whether the treated wood on display is green, brown, or bears a brand name, it's all
been treated with a copper-based preservative. The brown products have merely been coloured to mask the greenish tone of the preservative. This colouring is not permanent and may fade away, leaving you with wood that looks the same as the green version at the store. Note that the green tone of treated wood will fade as the wood ages, without any effect on the wood protection.https://cwc.ca/wp-content/uploads/2019/03/FAQ-durability-Treated_wood.pdf#page5