Easiest way is download "QVD Dictionary V2" from the below link
You can mention the location of your qvds and reload the qvd it will give u all the analysis on the qvds.
I meant more like, they should be all the same, but for some reason (Lets say, the SAP was down, or some data source was not available) the creation of qvd will not be successful.
QVD1: Column1, Column2
QVD2: Column3, Column4
QVD3: Column1, Column2
I want to check, if all of them are having the Column1 and Column2?