I've got std ZZR carbs on my clubbie just now (previously FCR39's) but the throttle cable isn't compatible. Asked Radical and they weren't sure, thought that a std ZZR bike cable might work but suggested asking around.
Having had both on my ZZR clubie (before the ZX14 conversion) I don't remember having to change the cable but minitici member on here should be able to give you the details.