Can 3497xA Modules Be Plugged Into DAQ970A Mainframes and Vice Versa?

No, 3497xA modules cannot be used with  DAQ970A mainframes and DAQ970A modules cannot be used with 3497xA mainframes. The reasons are: The modules were updated to enable improved temperature accuracy, faster switching rates and lower current ranges. The updates required complying with new safety standards (connector spacing, etc). To keep the modules physically compatible, max voltage would have been de-rated from 300 V to 150 V