The Cougar Magnum was called the Blackhawk Magnum
The DD44 Dostovei was called the TT33 Tokarev
The AR33-Assault Rifle was the Commando M16
Many of the weapons looked different than they do now, such as the KF7 Soviet, Taser, and D5K Deutsche
Most of the levels in the main game were open in Multiplayer, including the Aztec Complex and the Military Depot
Without a cheat you were able to access Connery, Moore, and Dalton in multiplayer
The Caves and Stack were levels in the main game, but was replaced by Aztec and Egyptian. The BETA Stack is what is now the Library.
The 2x RC-P90 cheat for the Caverns was originally Golden RC-P90.