I don't think there is one, they are different because each was made by a different production team both with different ideas on how it should look. As brilliantly designed as the Cloister Room was, actually seeing a star in a perpetual state of decay at the heart of the TARDIS is pretty cool and drives home just how much bigger it is on the inside.In-universe explanation, though?
Harmony, Melody, so that's where "River is the TARDIS" theory came from!!I wonder if Harmony was the name of a famous Timelord from yore, or if it does still mean as I had always assumed meant: Calm and peaceful.
Although in music, harmony is about a lot of noise cooperating to sound nice, which might cover the continuity gap of their being many eyes operating in harmony until the trillions of eyes seem just like one eye?
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