So is there a case to standardise the templates and/or content of these pages and where to find them in websites across government?
I think so.
From an audience perspective, there is a strong case to do so. Citizens often use multiple government websites and it makes their experience more streamlined and efficient if they can find what they need in a consistent place (such as www.agency.gov.au/privacy), written in a consistent format and, where possible, using identical or near identical language.
It would also save money and time. Rather than having to write and seek legal approval for the full page content (such as for privacy information), only agency-specific parts would need writing or approval. Websites could be established more rapidly using the standard content pages and lawyers could focus on higher value tasks.
Standardisation could even minimise legal risks. It removes a potential point of failure from agencies who are not resourced or have the expertise to create appropriate policies and expose themselves to greater risks - such as over poorly written legal disclaimers which leave them open to being sued by citizens.
In other cases it won't be possible to use the same content (such as for 'about us' pages), however the location and structure of the page can be similar - still providing public benefits.
Let's take privacy policies specifically for a moment.There's incredible diversity of privacy policies across Australian Government websites, although they are all subject to the same legislation (the Privacy Act 1988) and largely cover the same topics (with some variation in detail).
While this is good for lawyers, who get to write or review these policies, it may not be as good for citizens - who need to contend with different policies when they seek to register for updates or services.
So, how would government go about standardisation? Although effectively a single entity, the government functions as a group of agencies who set their own policies and manage their own risks.
Alternatively web managers across government could work together, through a service such as GovDex, to create and maintain standard pages using a wiki-based approach. This would allow for a consistently improving standard and garner grassroots buy-in, plus leverage the skills of the most experienced web masters.
There's undoubtably other ways to move towards standardised pages, even simply within an agency, which itself can be a struggle for those with many websites and decentralised web management.
Regardless of the method selected, the case should receive consideration. Does government really need hundreds of versions of what is standard content, or only a few?
Examples of government privacy policies (spot the similarities and differences):