The comp settings 1-4 and 1-5 are the same as EZ jumper settings 1 through 3.
Comp settings 1-1 through 1-3 allow defueling. (The EZ doesn't)
Comp power levels 2 through 5 all use the pump wire.
There is an informative post about Comp levels on the Edge website under forums. I have a link to it, but it's too long to post.