LCD Screen - The LCD screen is integrated into a plate that you can slide into the front of the Tarantula pro. On the old Tarantula, this was not like this at all. The screen was on a plastic bracket with a wire going to the control board.
Metal Plates - On all of the brackets there are green aluminium plates on the Tarantula pro, this will make it more sturdy. The old Tarantula it had black acrylic plastic, that can break easily if you don't watch what you are doing.
Bed Size - Tarantula Pro 235 by 235 X and Y with a Z of 250, the standard Tarantula had 200 y by 200 x by 200 z.
Volcano Hotend- The Tarantula pro comes with a faster printing hotend, it also comes with the TEVO Little Monster and the Tevo Flash. The standard Tarantula comes with Chimera slower printing speeds
Titan Extruder - Tarantula Pro Lightweight made with ejection moulded parts for better performance, The old tarantula is an MK8 extruder not lightweight less performance.