The two devices provide similar functionality in that they both connect a PC or laptop via its USB interface to a CAN bus. Both devices support the maximum CAN bitrate of 1 Mbit/s. However, both devices have unique designs in terms of internal circuitry and software API/drivers. There are other differences in terms of CAN message throughput, buffer size, etc. If you are using third-party software that specifically requires the use of the Kvaser Leaf Light V2, then I strongly advise against using a different type of USB-CAN interface.