First, let's define some terms.
IAT - Inorganic Acid Technology
OAT - Organic Acid Technology
HOAT - Hybrid Organic Acid Technology
PHOAT - Phosphated Hybrid OAT
POAT - May stand for Poly OAT or Phospated [H]OAT
IAT is the 'old school green', it uses only inorganic components, which almost always include silicates.
OAT uses only organic components, such as Sodium Benzoate or Sebacic acid.
HOAT is a hybrid of OAT and IAT, generally an OAT with Phosphate (PHOAT) or Silicate (Si-OAT) added.
Silicates are typically used by European manufacturers as they are compatible with the hard water in Europe, but the silicate concentration has to be maintained at the proper levels, and they can drop out and form deposits.
Phosphates are not compatible with hard water, but this isn't an issue in Asia, so Japanese / Asian manufacturers use it for its superior ability to protect aluminum, and because it doesn't have the drop out issue.
Silicates and Phosphates are NOT compatible with each other, and should never be mixed as it can cause accelerated corrosion, silicate drop-out, and even gelling. This can actually get worse the lower the concentration of silicates gets, so it's important to thoroughly flush the system before changing, and to never top up a PHOAT with silicates.
Okay, so what about Toyota coolants?
Toyota Red is a first gen PHOAT with Sodium Benzoate acid and Molydenum.
Toyota Pink is a second gen PHOAT with Sebacic acid and almost certainly Moly.
Toyota is unique as far as I know in the light vehicle market for using Moly in their coolant, most likely for water pump protection.
Zerex Asian Formula is a first gen Sodium Benzoate PHOAT, all the colors have the same chemistry, it's just a different die, no Moly.
All three of these can be safely mixed, but for the longest lasting performance you should stick with pure Pink.
The Toyota coolants were engineered by CCI and are blended in the US by CCI Illinois, the Zerex formula is from Glysantin.
I strongly suspect that the Peak Pink may be sourced from CCI Illinois and the exact same as the Toyota Pink, but I can't confirm that.
It's been a while since I looked at this stuff, and it's mostly off the top of my head so their may be errors, but hopefully this clears up some of the confusion.