I tried them at Tsukuba and they are about 2-3 sec a lap apart. The Trueno fits neatly between the two. FWIW the MR2 1600 g is ~352 pp the MR2 Spyder is 383 pp and the Trueno is 364 pp.
ps I just picked Tsukuba randomly to test on not because I think its the best track.
Toscana Lagunitas
or Toscana Manor Ridge
Would be nice.