wrong
Nothing is true. Everything is permitted.
In my opinion, the comparison is obvious but pretty shallow. What I found interesting is the assignation of the roles. What's it based on? Initials? Visual appearance? Genre savvy?
If I wanted to compare the roles of Shadows, Shivans, Vishnans and Vasudans, I would seek to answer these questions first. Who was it in Babylon 5 who were willing to declare exterminatus on anything and everything that was offensive to them - including entire
planets deemed "contaminated" or influenced by agents of the enemy?
Who is it in BP - and in canon FreeSpace - who generally just use violence as means to their unknown ends, and have been known to commit planetary annihilation on at least two separate occasions?
Also, who in Babylon 5 prefer to act with discretion and subterfuge, using intermediaries and select few associates to further their cause?
Who does the same in Blue Planet?
The comparison, in my opinion, falls apart when you consider that in Babylon 5's thematic, the Shadows were agents of chaos while the Vorlons were preservers of order. The Shadows thought that conflict was the best way for the galaxy to advance, while Vorlons thought peace and order. They were, in short, enemies in the sense that their plans for the galaxy conflicted and they made other species fight for their ideologies. These motives are quite understandable, easily comprehensible by human standards.
But when it comes to Vishnans and Shivans, what are their goals? What is their relationship with each other? What do they seek to accomplish and how? Canon games offer little to no insights to Shivan side of things. Blue Planet only some, regarding both Vishnans and Shivans. But both parties' motives are, at the moment at least, largely occluded to us. How do Shivans and Vishnans regard humans and Vasudans? Shivans certainly don't have any interest in a proxy war. In fact, with the sole exception of Ken and Laporte, all encounters with Shivans have been violent. Vishnans seem more approachable, but we really don't know what they're up to and what their agenda is.