I started out using Orcad back in 99 or so... I think I did my first 5-10 real PC boards using Capture + Layout. I think that was the basic configuration. before they did the Capture CIS stuff. I vaguely remember "Allegro PCB Editor" was a extra option that cost more money - It might have been a third-party product at that point.
Orcad's always been pretty well known for it's schematic side - I think it was pretty common for the circuit designer to use Orcad Capture, do a schematic, and then toss a netlist "over the wall" to the layout person. It was pretty common for the layout program to be a completely different software vendor. Doesn't make too much sense for us "1 person design teams" though...
The obvious thing is to look at the price tags - one of the packages is probably has a couple extra numbers added to it. Chances are that they probably also have a lot of extra routing algorithms and UI to deal with really insane things like routing the BGA packages - the things tend to have double-digit numbers of layers and such.