Why does Impressions and clicks data in Organic Search performance tab not match with Google Search Console?
Organic Search Performance data under Analytics matches GSC when page filter is applied in GSC. If page filter is not applied in GSC, number of clicks, impressions may not match GSC. This is because Insights pulls keyword level data from Google Search Console (GSC) and shows aggregated numbers, whereas Organic Search Performance in the Analytics tab shows page level impressions and clicks data.