The code reportted in the Dye Lot column indicates in which dyeing lot the piece was finished, each lot has a specific and unique code.
Therefore, two pieces with the same code will be identical in color. This information can be very useful if two different pieces must be used together.
If the Dye Lot code is different, there may be slight differences, although still in tolerance with the original fabric master sample.
When the Dye Lot code is 000000 it means that the piece is being prepared and therefore the information is not available yet for the piece in question, if two different pieces show this code it not necessarily mean they come from the same dyeing lot.