They were identified as Skyline Aviation Group (New South Wales) Bell Helicopter Textron 206L-3 Longranger VH-PGV and Statewide Safe Removals (Victoria) Bell Helicopter 206 Jetranger VH-HCV.
It appears they flew up from the South - VH-PGV was spotted at Lake Macquarie Airport also in New South Wales earlier in the week - and were being prepared to stay at Rocky for the night.
UPDATE! On Thursday 15 March, both VH-PGV and VH-HCV departed Rockhampton Airport in quick succession for Mackay Airport. They were then later noted continuing to Townsville and Cairns.
It is possible that both Bells are on delivery to the North, possibly Papua New Guinea (PNG).
Sincere thanks to local plane spotter Kayanne H for taking the time to capture and send through these great photos!
All photos taken by Kayanne Hardsman ©