They were conformed to the 1997 edit they physically took the o-neg apart washed it chemically replaced all the bad cri stock, and also replaced all the old opticals with newly recomposited effects from old film pieces Lucas saved. Even the 2k render of the cgi was printed back to film, this was all hand spliced together by a negative cutter with cement like the old days. In theory using several other sources you could reassemble the original edit. Has the duplicate negative with the misaligned color layer been checked in recent years? They can fix that digitally now but it wasn’t possible in 1997.