I went on to tire rack.com's website and punched in all the year and make from your post. It looks like the wheels will fit. The bolt pattern is the same; 5-108 for both vehicles.
It's more the offset you need to pay attention to. The 16" wheels listed as a "fit" for your XC90 has an offset 40mm. They have 18" wheels listed on that site for the XC60 also listed with an offset of 40mm.
A good reputable tire shop will be able to confirm whether it should fit or not. Perhaps even the dealer if you are on good terms with the service dept. Hope that helps.
'07 XC90 V8 AWD Ice White w/chrome 18"
Curt Trailer Hitch
'03 Nissan Murano AWD Silver
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