In what way do you want one to control the other?  Do you want changing presets on one to change presets on the other?  Do you want one to be the MIDI Clock master and the tempo of the other to be the MIDI Clock slave?  Presumably, you don't want parameter changes on one to cause parameter changes on the other, but that's possible to…  If you could specify what you're trying to do, I could let you know what settings you'll want to double check…