tatts now selling in nsw market, page-8

The differences are that OzLotteries would have a big head start with a much larger customer database.
Also, there are services and products that OzLotteries offer that Tatts do not so there is differentiation - for example syndicates and recurring purchases will only be available with Ozlotteries and of course OZL do the lotto points.

N.B. My understanding is that OZL will keep their prices the same to maximise profits as dropping prices may keep the revenue up but would not be good for profits. This is what they have been doing in the Victorian market with good success.