Yes, I see the difference and you see the difference, would Russia or other parts of the world see the difference ?Yes, Russia could. It's not a moral justification, rather a logical one. But there is a key difference between Euro/US-Ukraine relations and Iran-Houthi relations.
While the west supplies Ukraine with weapons and provides guidance on governmental reforms, Iran de facto controls the military actions of the Houthis. The difference in relations is therefore the difference between alliance and domination.
I'm not really arguing for or against just trying to see the wider ramifications and interpretations from others point of view in terms of wider world support. After all large parts of the world see no problems with Russia's invasion of Ukraine, many take an anti western stance and actually support Russia seeing the war in Ukraine as almost a holy crusade against the West.