AQA work book for edexcel mathsWatch
The exam boards are essentially have the same content (well mostly), I know that AQA have a few topics that is not covered in edexcel (like geometric sequences) but it doesn't differ that much. The main difference is how they word their questions in exam papers. So, using an aqa revision guide should not disadvantage you in anyway, but I wouldn't use it as your main form as revision. I'd recommend using maths genie as well as the spec and past papers to make sure you know everything you need to know for your edexcel maths gcse.