You're right; I think it goes Wedge-(1989), Evolved-(1994), Agressive Wedge-(1996), Evolved Gen. II-(1999), and Edge-(2001)
The bellypan was restyled on the Gen II sleds, (and the hood) but I don't think the dimensions changed, cause a long-travel Evolved chassis has the same ski stance as a Gen II. That makes for a cheaper redesign too. I'm not sure, but I don't think it changed. Either way, an Edge hood won't fit one.