Wrong GST number in filing GSTR1

As per Section 19 of IGST Act, 2017,  A registered person who has paid integrated tax on a supply considered by him to be an inter-State supply, but which is subsequently held to be an intra-State supply, shall be granted refund of the amount of integrated tax so paid in such manner and subject to such conditions as may be prescribed.

So, to be on a safer side you can pay both IGST as well as CGST-SGST and then claim a refund of the IGST amount paid, thus ensuring no interest liability.