Except that they aren't relevant for the menu background and there aren't cutscenes. Here's the first few lines of the Vorastra's file from .76:
TXT
entityType "Titan"
ability:0 "AbilityMicroPhaseJump"
ability:1 "AbilitySuffusion"
ability:2 "AbilityDesperation"
ability:3 "AbilityTheMaw"
ability:4 "AbilityTitanFleetBeacon"
defaultAutoAttackRange "GravityWell"
defaultAutoAttackOn TRUE
prefersToFocusFire TRUE
usesFighterAttack FALSE
autoJoinFleetDefault TRUE
canBomb TRUE
hasBombingLevels FALSE
baseDamage 90.000000
basePopulationKilled 2.000000
bombingFreqTime 10.000000
baseRange 3000.000000
bombTransitTime 4.000000
bombEffectCount 2
bombEffectAngleVariance 2.500000
bombEffectsDef
Compare that with the _Cosmetic file.
TXT
entityType "Cosmetic"
ability:0 "AbilityMicroPhaseJump"
ability:1 "AbilitySuffusion"
ability:2 "AbilityDesperation"
ability:3 "AbilityTheMaw"
ability:4 "AbilityTitanFleetBeacon"
defaultAutoAttackRange "GravityWell"
defaultAutoAttackOn TRUE
prefersToFocusFire TRUE
usesFighterAttack FALSE
autoJoinFleetDefault TRUE
mainViewIcon "MAINVIEWICON_TITAN_PHASELOYALIST"
basePrice
credits 9500.000000
metal 1200.000000
crystal 750.000000
slotCount 150.000000
BuildTime 450.000000
Clearly they house different data, but it is similar data and I'd like to know what the difference in purpose is.