The only meaningfull difference between Vspec and non Vspec is the rear A-LSD.
Can tell you my Vspec goes well with it, but don´t know how would it be against a non-vspec.
Suspension and stuff will most likely be aftermarket so... wouldn´t look it as a difference to be honest.
To know a bit more from different R33 series take a look into the following link:
One Man's Lonely Adventures In His R33 Skyline GT-R: How a Series 3 BCNR33 is Different From the Other R33 GT-Rs