EPQ Literature review vs Source evaluation

I have completed my source evaluation table for all my secondary EPQ sources using the CRAAP method. I am confused though, because I know some EPQ candidates have also made a literature review.
What is the difference between a (detailed) source evaluation and a literature review? In the literature review do I say what sources I am using for each dissertation section since I already evaluated them? Do I need to link the sources together??

Your source evaluation shows the examiner that you've conducted thorough research on your EPQ topic, and critically thought about how reliable the source is on its own. A literature review combines a lot of your sources and discusses how ideas overlap or contradict themselves in relation to your topic/question (it's kind of a smaller scale version of your epq in a way but a bit different)
To be honest you don't really need a literature review as you'll likely be discussing your sources in your EPQ anyway. You can always discuss your findings briefly somewhere in your production log, for example in your planning review or mid-project review (if you're doing AQA, not sure if it's any different for other exam boards). For example, you discovered something in one source that changed your opinion on something you found in another source, and develop that into how you're changing your approach.
But If you're stuck on where to start with your EPQ you might always find it helpful to scribble down a rough "literature review" by mapping out the various ideas and stats you've found in your sources. it's not really necessary to write a whole essay for it.
In terms of grouping your dissertation sources together, it's not really necessary at all. I divided mine into referenced sources and other research, but very few people i know did the same.
Honestly, no one in my class of 30 did a literature review and most of us got A/A* so don't worry too much about it!