Not sure if Silicon Power is making these for Corsair or someone else is making both the S55 and Force LS. The cases on both are similar.. but hey, all SSD's kinda look alike. It's not until you crack it open and look at PCB that you see the internals are identical.
Here's the Silicon Power S55 that I have.
And the Corsair Force LS. Picture courtesy of TechPowerUp.
The PCB has the same part number. On difference I see is the part number for the NAND and the 4 pin connector is missing on the Corsair.