Huh? Every time I played through daggerfall they were differen't, so no idea what you are going on about.
From the UESP:
Dungeon interiors consist of one or more "blocks" defined in BLOCKS.BSA and referenced (per-dungeon) in MAPS.BSA, which are "glued" together to create the appropriate scene. Dungeons may have up to (and including) 32 of these "blocks", each of which may have two passages connecting to other blocks in each of the four cardinal directions, hence the "mating octupi" term.
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So they arent created randomly on the fly, there are a few of these dungeon 'blocks' that get fitted together randomly.
These blocks can be huge, but are the same every time.
When you play Daggerfall you soon get to know these blocks intimately, and you will know for instance on what spots in the block a quest item or quest goal can be generated.