Here is the detail from the architectural plans.
308m tall version is kinda sad coz the 300m mark is only achieved within the Tuned Mass Damper room. The roof of the highest habitable floor is 292m with the winter garden taking it up to 295m but the winter garden is more like a terrace for the penthouse suites:
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For the taller version I only have the tallest 338m architectural plans saved. But for the 328m it will be the same floor where the building passes the 300m mark. Level 88 is where the building crosses the 300m mark with Level 88 roof being at 302.75m high:
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The 328m tall version will simply be cut at Level 91 with the TMD right above it. Apologies for not showing the actual 328m tall version of the building.