You are fine as it will be flushed. but they should not be mixed. The green will stuff everything.
Nulon make a red G12+ coolant you can get at SCA, both concentrate and pre mix in 6 litre.
Nulon Anti-Freeze/Anti-Boil Red Premix Coolant - Supercheap Auto
If you do need an emergency top up (less than 1 litre) and don't have the correct G12+ coolant, I would recommend just using some demineralised water. This would do the least amount of damage. Wrong mix rate would only reduce the boiling point a bit, you can correct it later with some more concentrate. But if you need to top it up there must be something wrong and chances are the whole system will be drained and refilled once the cause is fixed.
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