Most of the Dash appears to be the same, dash top, binnacle, and the middle vents section for only the 1.5, not 2.x where the 2 vent's are cut in half.
Door panels are different, door sills, and possibly the section forward of the sills that attach to the Dash.
Note: The problem with going with the Lotus CF parts, the CF weave will most likely be different and won't match that of the CF rollbar cover of the Tesla Roadster. Same with the inside, if you find other pieces for the Tesla the weave will be noticeably different.