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@Scilly.Suffolk
9 speed sprockets cover a wider area at narrower intervals, so provided an 8 speed chain fits through the cage plates (which I think it will) you shouldn't have any trouble, but it might run more *smoothly *with 8 speed jockey wheels.
You'd have to assume there is a reason why there are speed-specific wheels and it's not because the teeth are narrower, so it must be because they are narrower overall.