Okaayyy so I have figured out a way to make the duplicated go away...
(writing this for later so I can reference back

)
In Excel 2007 on the ribbon, go to data, and then remove duplicates. Select part number and let it do its thing.
In my case I need to be in the file with all the 124 numbers, and add the 624 numbers in at the bottom, that way it deleted the 624 assuming there was duplicates.
Now the only issue I am having, (I am unsure if there is a way to fix this) but I need to know if it is possible that when it is done this process, if there is a line in 124 that didn't have a duplicate in the 624 line then it would delete itself?
That way I wouldn't have stock that is not supposed to be ordered from that vendor being ordered, since it has changed over to a new one. I am unsure how to go about this though.