A: They differ in a number of ways. Corrections are welcome and the list is probably incomplete.
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Rear Wheel. Changes 3 times! Changes were made in 1986 and again in 1999 meaning different:
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drive rubbers
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rear sprockets
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hubs
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brake shoes
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Electrics. Change from 6v to 12v in 1991 meaning different:
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battery and battery box,
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wiring harnesses,
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bulbs,
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tail light assembly,
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headlight assembly,
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indicator assemblies and mounting,
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speedometer,
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switches,
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stators/generator,
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rectifiers etc
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Front Forks. Change in 1999 meaning also different:
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fork seals
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fork boots
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Swing Arm. Change in 1986 and again in 1999.
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Muffler. Change in 1999. Chrome Guards remain the same, black guard changes.
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Step/Foot Pegs. Change in 1986.
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Centre Stand & Side Stands. Changes in 1986 and again in 1999.
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Fuel Tank. Change in 1999.
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Carburetor. Change in 1986.
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Rear Suspension. Changes in 1986 and again in 1999.