Yes the Corsair is made by Seasonic. Looking at NewEgg, the SS is $140 whereas the Corsair is $75 ($95 - $20 MIR) ... $100 CAD ($120 - $20 MIR) I'd take the Corsair as they look like they seem nearly identical otherwise. The Corsair has 2 extra SATA plugs and the SS has 1 extra molex plug.
One claims to have +12 split-rail and the other single-rail but that may simply be marketing as it is with the PSU in my sig (which is actually a single-mail but marketed as a split)
I see you're in Canada but you should be able to find similar prices there.
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Yeah the PCBs look the same. If you look at some of the part numbers, even those are the same. The fan is the same also.
Corsair
Seasonic