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I think it might be confusing if the original Earth ever appears in the story. If the citizens of the new Earth never have any contact with the old earth, it should be OK.
Answer
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/2481 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/