Mickey’s Toontown Fair in Magic Kingdom actually had a distinctly different style from Mickey’s Toontown in Disneyland.
For example, here’s Mickey’s House in Toontown Fair:
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And here’s Mickey’s house in Toontown:
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Minnie’s House in Toontown Fair:
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And here’s Minnie’s house in Toontown.
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Yes, Toontown Fair was obviously still cartoon-like. But when you compare pre-Roger Rabbit Toontown Fair to post-Roger Rabbit Toontown, the influence of Roger Rabbit is readily apparent. Everything in Disneyland’s Toontown is much more curved, bulbous, and bouncy, which closely matches the aesthetic of Roger Rabbit, more so than the Mickey Cartoons which were generally more realistic.
They look like the same style to me. Are you sure you weren't thinking of Mickey's Birthdayland/Starland (which didn't even have a house for Minnie)?
Mickey's Birthdayland/Starland predated Toontown Fair by about eight years.
Honestly, I'm glad the houses look a little more cartoon-like, as it helps show off that you're in a cartoon world. The realistic designs may work in cartoons, but not so much in reality, I don't think.
Are you saying that the backstory with Walt and Mickey meant absolutely nothing back then?