Not both the same no. Shift lights show the ideal point to shift for max performance. That point is not necessarily (in fact almost certainly not) at max revs. If the lights change to red above 6k revs then they're probably not shift lights as I believe the max power point for a G20 is less than that.
[EDIT - Actually reading the wiki page
https://en.wikipedia.org/wiki/Shift_light it seems that the term means different things in different markets so maybe down to interpretation. Anyway my understanding is as above and certainly the most useful one. There's nothing to be gained from hitting the rev-limit]