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@Tebb
I wouldn't say there's anything particularly different. Check that they're compatible with your chain size i.e if you're currently 8 speed then your chain might be too thick for a 9 speed crankset.
Also, there are a number of BB fittings so check that it is compatible with your BB.
From a quick google it looks like the tourneys are for square taper and the alivios are for octalink in which case you would need a new BB, but you may want to double check.
HTH