VeSys does not have any compare capabilities however there are free tools on the net that will compare Excel Spreadsheets
Thanks for the suggestion, I know some good Excel users and so I'll look at getting either a Macro written or one of my colleagues can write an application to do this.
As an update we have now written our own tool that will compare and report on the differences between two BOM's.
When we compare BOMs we compare also netlists.
A netlist change is not less important then a BOM change.
When a BOM change is found we show the cell (footprint) of the old and the new part, if it exists.
This is to verify that the new part can or can not be assembled without any change in place of the old one on the PCB.