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They definately reused room 'maps' in the game, placing different objects, and enemies about to change their overall appearance.
As mentioned they similarly reused a set of characteristics for enemies, so although they vary, there are not that many variances.
I doubt loss of developers/artists, money, or taking shortcuts had anything to do with it.
More likely done to make the game more efficient.
Similarly to how they reduced the number of polygons in our avatars to optimize frame rates.
Its not unusual for games across the board to reuse textures to optimize memory usage either (such as faces, etc).
Fewer textures/models/maps to load the better the game runs, faster it downloads, etc.
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