PPG didn't change the formula. Sikkens had changed it prior to the sale to meet US import requirements for the 50 States.
Sikkens sold the US rights to PPG along with name for five years (five years are already gone).
Never mix products that aren't supported by whatever you choose... the stain manufacturer will not honor the warranty. Remember for wood... seal the ends.
If you already have a product on that is not the one you will be applying, you will need to strip the deck. If it is new, you may want to use the deck wash as the boards may have sat in the yard for some time. After that a brightner... it deactivates the wash/stripper, removes mill glaze, and shouldn't interfere with stain penetration for oil or bonding for latex. The other option to do this is sanding with a rough grit - this actually works better, but people hate the effort.
PT needs to be laid tight, as it gaps when it dries. The gap is the hint that enough drying has occurred for the board to accept the stain - oil need space to enter the board and latex needs a dry enough surface to bond. If you feel unsure on that - inexpensive moisture meter is worth the cost.
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