There are[I think]3 types of coolant.Non OAT,OAT and HOAT.You can mix them like for like no matter what colour,so you can mix any non OAT with any other non OAT and so on.What you can't do is mix and match as in mixing a non OAT with an OAT etc. as it just gels/sludges up if you do.What colour is the coolant you have in the car at present?Stick with that for peace of mind.Many on here will tell you to use only genuine Volvo coolant-and fair play to them for doing so-Personally I use the blue stuff as it's cheap as chips and mine is a 17yr old car that's had its coolant changed no end of times prior to my ownership and I'm not that precious about my car to use only genuine Volvo stuff on it,whatever's cheapest is my way forward.
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