"suspension" could mean a host of things (ie- springs, shocks, sway bars, chassis stiffening bars, etc etc etc)
However, simple answer: Yes, the sedan shocks/springs (or coilovers) will supposedly bolt up, however that doesn't mean that they're correct for the car. I don't believe that the verts don't share the same part #'s as their sedan equivalents. I know that the f-sport stuff was different for sedan vs vert.
What specifically are you wondering about? Also, may wanna check out the ISC thread for other owners that have modified their ISC's.
2010 IS350C -- Obsidian / Black; luxury pkg
Mods: 19" ISSforged FM-8 w/ Michelin Pilot Sport PS2 | F-sport exhaust, intake, springs, shocks, sways, & **** | LX-Mode chrome handles | Sport Pedals | PIAA Yellow fogs
And no, it's not an F-sport
2006 IS350 -- Blue Onyx Pearl / Sterling; premium pkg SOLD
My brother in law's IS250C has Megan LP coilovers and on the website, they are listed as 10k front and 12k rear. Same coilover but for a ISx50 has 12k front and 8k rear. Suspension looks like they interchangeable but springs/shocks are different.