See both the within-state (CGST+SGST) and between-state (IGST) breakdown for the same sale amount.
Both scenarios collect the same total tax — only how it's split (and which government collects which part) differs by whether the buyer and seller are in the same state.
CGST + SGST: Each exactly half the total GST
IGST: The full GST amount, unsplit
Does the buyer pay more for an inter-state purchase?
No. The total tax amount stays the same either way. Only how it is split between the central and state government is different.