Mapping NSE instruments to BSE instruments

Krackmind
Hi, i have been trying to find a pattern where i want to map NSE scripts to corresponding BSE scripts, but have been unable to do so. I have already tried mapping by tradingSymbol/instrument_name, but there are still some mismatches. Is there a way to do this?
Mapping by tradingSymbol maps almost all the scripts, but not everything.
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