When we measure performance through OKRs, we look for improvement in certain elements, fulfilling a particular objective.
KPIs are entirely different. Here we measure the performance indicators and are not solely focused on achieving a target.
KPIs may help you with a variety of objectives in a team. However, OKRs make you focus on a specific objective. KPIs are flexible and can be changed as per the requirements. Whereas OKRs are to be recreated for every objective.