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seafish
PhilDAS
Not very clear. I suspect just different crank options. Anyway, one will absolutely not work with the other. As I said, GXP is 24mm and bb30 as the name suggests is 30mm. A bb30 crank will be physically too big to fit in a GXP bottom bracket and a GXP crank will rattle around in a bb30 one.
Bb30 is not threaded so won’t fit in your frame. You will need either a GXP bottom bracket if you have a GXP crankset or some sort of BSA threaded bottom bracket with 30mm spindle and tiny bearings to adapt to bb30, if that’s what your crank is. Rotor and a few people make things like this.
Again, you need to know what crank axle you have