If the new code is a clean reimplementation of the function of the old code, that is, not based in its source or principle of working on the old code (e.g. copy

If the new code is a clean reimplementation of the function of the old code, that is, not based in its source or principle of working on the old code (e.g. copy large parts of the logic from the original code), it should be quite fine. Porting an existing code to a new language isn't a clean reimplementation.