Yep i've done it. I sourced a brand new vx manifold and plenum which I match ported and polished and installed on my vs.
The vt manifold will not have the provision for a coolant temp sender (the small brass one that works your temp gauge) which on the vs is threaded into it just under the thermostat. So on this same spot on the vt manifold you are going to have to drill a hole and tap a thread for it. It is a tapered thread, not parallel, so the further you screw the sender into it the tighter it gets. I'm almost certain the thread is 1/8NPT. The thread for the coolant temp sensor (the larger one also into the thermostat housing) is the same between models so just swap the sensor over from your vs.
The plenum is also different. On the back side of the throttle body flange there will be a hole that is roughly 15mm diameter from memory that on the vt-vy models is hooked up to the EGR valve system. This does not exist on the vs models so you will need to fill the hole somehow. I welded mine, but if you dont have the gear to do this you could also cut a thread in the hole, and then thread in a bolt with thread sealant to blank it off.
The PCV valve setup is slightly different, but does function just the same. The minor difference being in the point at which the crankcase hydrocarbon gases are fed back into the plenum. On the vs plenum this hole is in the back lefthand corner, whereas on the vt-vy plenum it is located on the right hand side in the centre of the plenum. You will see on the top machined face of the manifold that there is a little channel for the gasses to pass through to allow this slight difference. All this change does is makes re-combustion of these gases a little easier as they are drawn into the manifold ports with the air intake through the throttlebody. That probably sounds a little confusing but you will understand once you compare the two.
The valley/manifold gaskets are the same on all ecotec's, but the manifold to plenum, and throttlebody to plenum gaskets are different on the vs to the vt-vy as the vs uses o-rings on these, whereas the vt-vy uses a metal gasket on the manifold to plenum joint and a paper gasket on the throttlebody to plenum joint.
While your at it i'd also recommend using the vt fuel rails as they are solid steel piping with no flex-joins like on the vs which have been known to leak.
Hope that helps