Rolls come in three configurations, heads/heads (what you have), tails/tails, and head/tails. In Australia Head/tails and head/head are the preferred configuration for most collectors simply because you can easily tell what year the coins are in the roll. Tails/tails rolls usually sell at a bit of a discount to the other two types because of the uncertainty of the year. This is even the case when there's a concrete provenance for the tail/tail roll (for example it was taken from a mint box of a known year).