Same-day settlements are the same as normal settlements except that it’s settled at T+0. So you can find the settlements in the settlement report and the combined report on the payment gateway dashboard.
On-Demand Instant settlements are non-recurring payouts from your settlement balance, so such settlements will appear as payouts in settlement reports, combined reports and also in the On-demand payouts here: https://dashboard.razorpay.com/app/instantsettlements