According to the 0351149 game program, Var. 99 is 92.378%, Var. 01 is 92.344%.
There are only two sets of reels in the game data, one for the base game (1-20 lines selected), the other for the Cashman bet.
As there doesn't seem to be any extra reel data between the two variations, the different payouts are most likely entirely based on the Cashman minigames (for example, the win frequency, or maybe even the frequency of actually triggering the Cashman bonus). I don't know if the 92% means the base game (1 line/1 credit) or the Cashman bet as the game doesn't show that info. I'm guessing the 92% includes the Cashman bet, as the Australian versions tend to show around 87%.
In the game data, only one thing seems to be different the the Cashman bonuses - one version of the random credit bonuses has a 12000 credit max, the other has a 10000 max (I assume this is variation 01 - in both bonuses, the second prize in both lists is 10000 credits thus variation 01 has two identical 10000 prizes instead of 12000 then 10000)