Yes, a hydrogen generator will work on any engine, gas or diesel. The right kit for your 2014 Honda Accord is the S-7 Hydrogen Car Kit.
I think you might be asking about the FS2 HHO Chip which is one of the options for computer enhancement which is needed for any fuel infected engine.
If your 2014 Honda Accord has the same engine options as the 2013 model then the settings for the 2013 model would work for you. Otherwise you will have to wait for the update that adds the 2014 model to the selections for the FS2 HHO Chip.
Your other option is an EFIE and or MAP/MAF Sensor Enhancer.