I'm not 100% if I understand what you're asking but here's how mut repping works:
You have a current king who you like the appearance of, but want to change his mutation, so you find an heir with your desired mutation, stats, and heritage. When your current king is retiring, you choose the option to 'keep current appearance' of the retiring king, so the new king has your heir's mutation, heritage, and stats, but has the same base, eyes, skin, and marks as your old king.

Sorry if this doesn't answer your question!!

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There is no way to get around the 10 GB except waiting until he ages to 15.
If you want to Mut Rep immediately you will also have to pay 15 GB to bypass the 30 day wait in between kings... So 25 GB total.

If you wait 30 days it will only be the 10 GB.

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its essentially like cloning your king but this time he has different stats, heritage, and mutation. you need to king the one you want the appearance of first, then the mut rep. other than paying 10 gb for early retirement, you can wait for him to get old enough to retire.

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Also when I say 30 days, I should clarify it's 30 Rollovers.

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Thanks everyone!!

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