not much difference between the two, the PB has different handbrake brake and should have an alternator not a dynamo, there are however lots of variations around depenting on year or place of manufacture, some have Rootes engine, some have a Perkins etc etc etc unless you really know your stuff (I don't) it can be difficult to sort out one from the other unless you have all details of the vehicle in question, its easier to just buy it if its right for you and sort the tech stuff out later, as long as it runs and is in good nick that is
Hi have seen this one and ridden in it, am still thinking about it, non original inside, cupboards all moved about, was automatic coverted to manual, needs a far bit of work.
There is obviously some rust around the lower panels and, according to 45rpm, seems to have been a bit neglected and grubby on the inside. The fact it has got a recent MOT would suggest it's worth a look if it is not too far away. It all depends on what you want but I would expect a fair bit of body work involved to preserve it for the future.