This is what have been advised regarding the European versions of the above two coolants:
"Dear Sir
The main difference between the Subaru antifreeze from Switzerland Super Coolant Long life K067EYA004 (silver canister) and the original Subaru antifreeze from Germany K067EYA000 (black canister) is the technology and service life of the antifreeze.
Switzerland - technology is of classic carboxylate antifreeze, the additive acts specifically at the site of corrosion formation. Type SNF, additive G30. This type of antifreeze is suitable for Subarus from 1977 to present. Service life 5 years or 100,000 km.
Germany - phosphate lobride technology P-OAT. Used as a factory fill product since 2011, in >MY 2012 cars. Forms the thinnest film and sends the additive directly at the site of corrosion formation, like G30. Service life is 11 years at first filling, then 6 years or 120,000 km.
This one is suitable for your BRZ MY 2018.
Both types of antifreeze can be used in Subarus, but THEY CANNOT BE MIXED!
Important: mixing Silicate Nitrite Free and Nitrite Free (G48 hybrid technology) is prohibited, as well as with lobride (G40).
When changing the type of antifreeze, it is recommended to carry out the change with certified equipment at Subaru service!
Regardless of what antifreeze you use, it is useful to have a supply of the exact antifreeze that is poured into the cooling system when traveling.
Best Regards"
