Yes. The primary difference in ME3/s defensive powers is the effect once you deactivate them; Tech Armor sends out an AoE electric pulse for damage, Fortification applies a temporary buff to melee damage,Barrier releases an AoE Biotic blast(much like Tech Armor, but with less damage and enough force to toss unshielded enemies away), and Defense Matrix restores a portion of the user's maximum shields.
The other difference is that Tech Armor offers better protection (max. 40% as opposed to max. 30%) than the other 3 at the cost of a higher cooldown penalty (at max protection level, TA gives an 80% penalty, while the others only give a 60% penalty). Luper567 (talk)