Funding coups is not the same thing as funding terrorists. Terrorists attacks and kills civilians, coups just targets leaders. If Iran funded coups in nearby countries that would be a sane thing to do, funding terrorists is what makes them an insane force that you can't predict what they will do with a bomb.

Russia also funds coups, not terrorists. You didn't see a lot of suicide bombings and such in Ukraine before Russia attacked, Russia did the sane thing and sent in Russians in the Russian areas to build support etc, funding terrorism is just plain evil and serves no purpose. That is the difference.