First, I do not believe you can legally protect a layout, so if someone wanted to completely copy one there would not be a legal course of action if the theme/code was not taken.

Next, there are a few other core differences:
1) WW has a second ramp, a side-ramp, that the third flipper can shoot. So JP has the T-rex, and beneath that is the loop. WW has the loop, and beneath that is the side ramp (which does not feed to a flipper, but rather the right-hand spinning disc).
2) WW's right-hand ramp lifts, and behind it is a kick-out hole. On JP, the kick-out hole is the far-right shot and is thus in a different position.
3) WW has the ball lock in the lower left, stacked like the shooter lane, and thus the entire lower third is shifted to accommodate that versus JP.
4) WW has drop targets and a spinner, toys missing from JP. JP has a captive ball, which WW doesn't have.
5) JP lets you shoot into the pops from the upper flipper. There's no opening on the side to do that on WW (for WW's lower pops).

I think both are fun. They shoot similar, but rules are different. I find both somewhat clunky. JP's rules remind me more of TAF than WW.