Pegasus32 supports Thunderbolt3 and USB protocols and ships with a passive .7 meter Thunderbolt3 cable. 
The Pegasus 3 on the other hand ships with an active 1 meter Thunderbolt3 cable.
The Pegasus32 will work with an active cable however will downgrade the speed to USB2.0 performance.
We recommend to use a passive Thunderbolt3 cable if you want to take advantage of the Thunderbolt3 speeds.