Not sure where you’re getting your facts from. I stand corrected on the timeline - that positioning has been in use for closer to twelve months - but is actually their third music positioner since September 2015.
In January last year they introduced the ‘Perth’s Real Gold’ music positioner, which ran alongside the ‘Experience the Change’ publicity for the Carmen & Fitzi show. I can’t quite tell when exactly this was dropped in favour of the ‘Better Music & More of It’ positioner, but the press release announcing their departure from the station in October 2017 supports this.
Having the same music positioner doesn’t mean the stations have the same format or the same playlists/music logs. While there is overlap, Gold 104.3 Melbourne has a different playlist to WSFM Sydney, which notably introduced a number of 2010-era songs that Gold is yet to play. A few of the ACE Radio stations in Victoria also use the same positioner - Edge FM in Wangaratta and Deniliquin, as well as the recently converted 3YB FM. Again, the former has a different playlist to the latter.
96 could easily sit as a Pure Gold station, but remember they’re targeting similar demographics (18-39 year olds) as KIIS, Mix 102.3 and 97.3FM are. It’s not the same format as the KIIS stations, nor Mix Adelaide or 97.3 in Brisbane; I’d describe it as a male-skewing Adult Contemporary format, but even that’s up to interpretation.
Remember the dynamics of the Perth market is completely different to the east coast. While hit92.9 and Nova 937 are not dissimilar to over east, there’s no Triple M. Mix 94.5 is that network’s local station, but carries an entirely different format. 6iX has the ‘classic hits’ side of things all to themselves, yet no-one seems to care.