The socket on the back of both these cards is a DMS59 and clearly there are two sets of VGA signals
https://commons.wikimedia.org/wiki/F...S59_pinout.svg
If you are getting a duplicate image on the second monitor you need to double check the settings are correct for and extended desktop. The default setting will not necessarily be the same for the previous card.
Peter, the nice thing about Vidblaster X, is the output module "takes possession" of the secondary screen, as it were. No dragging across involved.