[cobred]

I have an apointment for a chassis dyno session on Saturday. My car was on a dyno jet 3 years ago and is now going on a mustang dyno. I have made a few changes since then but my main reason for this session is some timing tuning.
I'm curious if anyone knows the difference between the 2 dynos as far as what h.p. will show? In other words, will one read more or different then the other?