Thanks @spikeyxxx , I’m glad you liked my submission and write up!
As to the cones, here they are in Eevee,
here they are in Cycles,
and here is the material setup.
As you can see, the Cycles version looks more like smoke or something, more grey in color, and finer. On Eevee, if I lower the “From Max” value the hologram looks to less “dense”, more granular, but on Cycles it just looks as though it gets darker. I played around with values, swapped the white noise texture with a high scale noise texture, even played around with a volume shader instead, but I still couldn’t get the more granular but still white in color look that I can get in Eevee.