Use one H9 as your controller. The H9 can be configured to output a MIDI Program Change when a preset is selected. It’s not in the app so you’ll have to dive into the menus on the box. You can set each preset on H9 #1 to output a PC that will load a preset on H9 #2. You can also tell it not to output a PC for specific presets. With a little planning you can set things up to work quite well and save yourself some pedalboard space.