RedZones RZ1 &RZ2 are part of GA. Just more expensive. They are segregated from normal GA.
besides proximity to the main stage, some perks and conveniences might also be included.
During i +e tour, upon entering the arena, GA tickets holders - and I assume RedZone GA tickets holders - had to make a choice between North Side & South Side of stage - i.e. Edge’s side or Adams side. If in place for this tour, it may prevent any movement between zones, but I’m not sure.
the stage will divide the arena floor including the Redzones. Trying to move between would be a pain in the ass.
However, i don’t think there’s anything preventing RedZone ticket holders from moving between RedZone and GA.