Even if they are the older editions, it doesn;t really matter.
Some subjects have changed drastically - in particular, Air Law. An older edition really won't do; certain things will be wrong. Some of those may be things you need to know in order not to get prosecuted by the CAA, never mind just passing the test.
Also, if you are interested in the full story, it's good to have the complete book.
But if you only want to pass the test, the confuser will be more than sufficient.
If you want to be a pilot, you need to be "interested in the full story" for such subjects as nav and met. Just passing the test is not enough.