TBF The Cabal Armor is harder than Hive Ship battle armor and was designed to be better defended and Hive Armor can withstand
several hundred Gigatons worth of force without a scratch.
So the Carriers while they lack personal shields are extremely will armored and basically eat the entire Citadels fire Mass Drives with no damage, but EMP's will probably crash the ships because they're vulnerable to power EMP's.
The problem is ultimately there's only 200,000 C-Sec forces who have to cover 54km in comparison each Cabal Carrier is about 680 meters in length with several decks.
So it's roughly 2x a Naval Carrier so comparatively it should have at least 10,000 Troops so roughly 200,000 Professionally Trained super soldiers total which are going to be a good deal superior in skill and gear to the C-Sec forces imo.
Hmm in this case tho the Shadow Legion ships are going to be flying fortress that could eat fire power that would annihilate several armadas several times over.
They could honestly probably take over the ground combat and use their Psions to turn the Citadels on features against C-Sec and they're capable of calling reinforcements quite easily and quicker than C-Sec.