In essence, and this depends on hpw people categories position of course, all the positons are the same, so ranges for those positions don't change.
For example, 8 handed, you still have the same Button range, then CO, HJ, LJ, MP, and theoretically UTG+1, technically this is also UTG, but you can treat it as UTG+1, in terms of a range, and therefore ranges for these positions doesn't change.
For 9 handed, you then also have an UTG position added in which should be the only thing you change. You add in this range to your ranges above.
In effect 8 handed is just the same as 9 handed except the true UTG always fold!!