Changing circuit board on Atwood 8900-III hydro-flame furnace. The old one has 2 flat prongs, marked BLO and PWR. The circuit board?

that the ebay dealer sent me has 4 flat prongs in that place, marked 24U , R , L1 , and IND . Can anyone tell me which hookup to put where? If i cannot install it today i will be cold tomorrow.
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