Robot_localization ekf vs ukf process noise

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Both filters use the same process noise covariance matrix parameter. However, I'm guessing what you're asking is whether the output estimate error covariance matrices would be the same for the UKF and EKF. I've never done any analysis, but I would expect them to be similar, but certainly not identical. They use different methods for projecting the state and error covariance matrices forward during prediction.