The Super Viento basically looks like a VR-4 except it's missing the sideskirts and instrument cluster with boost gauge etc. It has the same interior, same seats, rear view wiper, 15" alloys, climate control air con etc.
I wouldn't use the term 'JSPEC' so loosely, JSPEC or JDM or whatever the word for it could describe any model out of Japan, from the early base model E31A 1600cc steel bumpered, wind up windowed Galant G right through to the AMG Galant or the VR-4 Galant. There are typically no less than 10 different variants of Galant for every year from Japan and then when you apply things like pre-facelift, facelift, Evolution etc to the mix it makes it even harder to keep track of every model.