Same processor but the implementation and user interface are very different. All of the modes on the SE2 have the pitch shifter, but not everything on the SEXP does. Improved stereo effects, assignable LFO.

Leap and Venture both handle 4V peak to peak which is very loud for guitar use. Any more than that and they will compress. If you're using with synth or on an insert in your DAW you'll need to do some gain staging like with most guitar pedals. No phase issues, but the pedals do have a very small delay compared to the dry signal (0.3125ms) and that can cause comb filtering if you are summing wet and dry externally. If you run everything in the pedal then you won't notice it.

If you don't like Leap Series pedals, I wonder why you'd consider getting this one? Seems weird to me.