What was the actual reason for the change in appearance of the GBs?
I've assumed it was something to do with likeness rights, but simply giving Egon and Ray dark brown hair wouldn't make them look exactly like Harold Ramis and Dan Aykroyd. I'm thinking the actual reason was three of the Ghostbusters are brown-haired white men in beige jumpsuits. They wanted the characters to have unique looks so kids wouldn't mix them up. That's probably the reason they gave them unique jumpsuit colors as well.
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