Like I change it up a bit and adapt through using key words in the topic. But for the most part all my quotes and analysis are the same, i just change them slightly to fit the topic. Not all 6 paragrapghs are suitable for every topic but usually 3-4 work for each essay so I'll just include those paragraphs.
I wouldnt recommend memorising... i feel like its too hard to adapt to the topic but that's just me. Usually I start by saying the title of the text, the author, setting, unpack the essay topic and then the contention. After I'd move onto the body paragraphs.