One of the major differences is using a rechargeable lithium battery which is chargeable via the USB-C port. If the Padlock 2 battery is flat, you can charge it using a power bank instead of a 9V alkaline battery.
Saw one of my colleagues bought the Lock Pick Set With Transparent Practice Padlock from Lazada and it looks fun to play with. It is similar to solving puzzles.
So I decided to get the same one for myself as well. Bought it for S$12.73 with free delivery within Singapore.