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It all essentially comes down to budget from the original series and advances in makeup, costume design etc. However, Star Trek have tried to create a storyline to explain this - The Klingons tried to create Augments (Genetically superior Klingons) based on the research by Dr. Noonien Soong in creating Human Augments. The DNA used by the Klingons had an effect on they're Cranial Ridges.

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15y ago

What else can I help you with?