It's a bit hard to tell from that photo but they are actually two pieces of different sized vacuum hose, 6mm and 8mm, for attaching to different sized vacuum ports/nipples on the intake plenum.
The Wurth system cleaner is a bit different to the Subaru stuff. The Wurth cleaner is more of an aqueous solution, while the Subaru cleaner is more of a foaming agent. Which is probably why the instructions for the Wurth cleaner are a bit different.
Subaru cleaner on the left and the Wurth cleaner on the right, which you can barely see.
Both work well, and cost us about the same price at about $14 to $15 a can. I'd say the Subaru cleaner cleans the plenum better, by design and it's intended use, by breaking up the carbon deposits in the manifold. But the Wurth cleaner, due to its more non-combustible nature, seems to create more smoke/vapour/steam out the exhaust which I assume is due to the breaking down of carbon in the combustion chamber. But I'd say it's much of a muchness.