I'm not exactly sure what you mean by interchange, but both use the same driver, NI-DAQ. So if you have a version of NI-DAQ that is compatible with both devices (the last few versions are), the driver will recognize both devices. NI-DAQ will probably associate a different device number for the new board, when you put it in. So programs written for the other board might have to be changed slightly to account for the different device number. FYI - you can download (free) the most recent version of NI-DAQ here:
http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BBB002C128D?opendocument&node=132060_US
-Alan A.