Sorry about the delay. The devils in the details with these ones. At first glance the only difference is the look. However the small differences are the way they attach. The quick release on the earlier version is on the mount to sight and on the new model is on the mount to rail. Another small difference is the flip to side release is bigger on the newer version. The newer version also comes with spacers for the new Eotech Military models such as the 553 that come with the arms throw lever.
Cheers
Ryan