Just for reference, there are multiple other forum posts discussing this which all confirm that observations like these should be made as separate observations:
https://forum.inaturalist.org/t/how-do-i-add-new-observations-with-different-dates-but-the-same-location/33601
https://forum.inaturalist.org/t/single-specimen-single-observation/32330
https://forum.inaturalist.org/t/making-multiple-observations-of-the-same-organism-s-when-it-has-undergone-a-notable-change/31271
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