There are multiple ways to get 3D video. SBS (side by side), TnB (top and bottom), checkerboard, blu ray frame packing. But there isn't an active vs passive signal. If there were, then you'd have to buy different blu ray discs depending on the display type.
"One of the things I'm wondering is will a '3d' projector display a better '3d' image of a passive variety compared to an equal '2d' projector model."
Not quite sure what you're asking but a 2D projector model cannot display 3D so yes the 3D projector will display a better 3D image.
When talking about projectors, unless you're going to spend gobs of money you will be looking at active systems. A passive system requires 2 projectors, a silver screen to maintain the polarization, and some way to split the video signal (like getting 2 optoma 3D XL boxes). You're looking at an expensive premium that would cost probably 4X the cost of an active system.
I have been reading about the Tru3D system, they have a polarizer that converts a projector from active to passive 3D. It costs 1500 by itself, plus you still need a silver screen to maintain polarity.