Actually, the last one is V3 SAE. Next to that it's SR2. SAE have the expressions already injected, and also have the same option for scaling hands as Aiko 3 has. SR2 makes her compatible with the International Beauties morph package. I believe these are the major features in them, please correct me if I'm wrong. I'm a little slow on the updates so I'm still using SR1 =)