There can be many reasons why similar apartments in different blocks have wildly different levies. On top of the unit entitlement items mentioned by Jimmy, there can be other reasons for differences between blocks.
Between blocks it will also be affected by the level of facilities and amenities in the block. For example does one have luxury foyers with plush carpets , with artworks, cleaned daily, and a 24×7 onsite concierge and manager, plus well kept gardens maintained regularly. Another block can have tiled , simple utilitarian foyers only cleaned weekly (or monthly). Also look at then number and age of lifts, pools, gyms and their equipment and other amentities such as common BBQ or cinema rooms.
Similarly on age and past financial performance- is one block adding to a low sinking fund, as there are large expenses coming – eg new lifts, or major works such as painting that were not correctly budgeted for in the past.
Perhaps one block has a poor insurance claim record, so much larger premium to be paid. Different strata managers can also charge different fees.
There is also the differences in how buildings run – some like to run on bare bones finances with just enough to cover expenses, others run with large buffers for “just in case” scenarios.