The technologies "reintegration" and "returning armada" have two levels, but there is no described difference between the two levels. After researching level 1 you can research level 2 of the tech without any idea what it does.
I have checked the ability returning armada and saw that there was no change in the cooldown or energy cost. So I can only assume that it causes higher end ships to be acquired, I Wouldn't know...
And as for reintegration, I never used it. But it would be nice if it specified the difference between tech level 1 and 2.