Retratrutide V Wegovy

Does anyone have any experience with the new Retratrutide as opposed to Wegovy , I have been using Wegovy for almost 2 yrs and my husband has just started taking Retatrutide as an alternative ? It seems much cheaper however not FDA approved yet in Australia ? Thoughts if anyone has gone off Wegovy and onto this instead and any results . My husband has been taking it for only 2 wks so too early to tell