Certainly on P2/XC90, the 316mm caliper is the same for a 336mm disc and needs only a different carrier to accommodate the larger disc size. Pads are the same also.
Much like how the 286 and 305mm discs used the same pads and caliper but with different carriers.
I don't know if you'd need longer flexible hoses though.
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2002 S60 SE D5 Manual
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