Can you convert truncated UPC/Bar Codes?

[unc2plo]

I am comparing the UPCs of grocery items between two lists. I am running into an issue with one list having a truncated UPC, so I am not getting many mathces.

Pillsbury 8 oz Crescent Rolls is one example. The full UPC is 1800000401. One list has the full UPC, and the other one has 184010.

Is there any way anyone knows of to normalize the UPCs up to the full UPC, or down to the truncated version?

Thanks,
unc2plo

 

[unc2plo]

After a little more googling it seems that I am trying to convert UPC-E to UPC-A.

I have found UPC scanners that can do it, but noting in excel.