I'm using G.Skill the 64gb CL40 kit liked below with pop os and haven't run into any issues.
https://www.newegg.com/g-skill-64gb-262-pin-ddr5-so-dimm/p/N82E16820374492?Item=N82E16820374492
this post was submitted on 01 Dec 2023
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There is minimal difference across brands for RAM power consumptions as they follow JEDEC standards. Increasing RAM capacity very slightly increases power consumption but it's not noticeable. The best option is just to get the cheapest 5600 mhz kit (unless you want to game as well in that case you might want to look for a CL40 kit).
I ended up getting the memory kit from framework to ensure compatibility in the early batches and I have 2x32GB and they are CL 46. I have ran into problems in the past with having to tight of timings with large capacity of ram and cpus memory controllers not being able to handle it. I am not really sure what the limits are for the 7840U because for a laptop I just want it to work and didn't explore those things.