As per Circular 135/05/2020 GST , no you cannot claim Refund of Unutilised ITC on account of IDS where the inversion is due to change in the GST rate on the same goods.
As when the rate changes for any goods at the point of time the Input & output rate of said goods is same.
& in case of IDS in term of sub-section (3) of Section 54 of CGST Act the refund can be claimed where the Credit is accumulated on account of RATE OF TAX ON INPUT BEING HIGHER THAN RATE OF TAX ON OUTPUT SUPPLIES.
Cost is accumulated due to interstate purchases and made local sales. input igst is adjusted against cgst and sgst if any excess in input igst. there is input of cgst and sgst on local purchases which is accumulated how to claim of refund of cgst and sgst. every month cgst and sgst accumulated please let me know how to claim refund