i just had a quick look at the civic body, and it is infact very similar to the active potenza SP-R.
the rear wing mounts are almost identical, with the civic mounts being slightly further back, and the bootlid on the civic having a lip (like the kawahara is250.
also the civic has the kawahara is250 rear wing, which is very similar to the active potenza spr wing.
these two bodies i am guessing will handle very similar, the noticable difference is the civic has the large and deep front windsheild side pilars which may aid in the front end steering. the active has similar pilars but not as pronounced.
i recon east used the active racing body as a rough template when they designed the civic
will be using these two bodies next week and i'll be able to provide a comparison. Looks wise the active looks nicer