idk, my doses are kinda just "however much is in the dropper." I also haven't really dealt lots with shrooms so idk how strong a trip is. plus, different people react to the two differently. I know people who find mushroom and mushroom-based products far more intense than lsd, and other people who think lsd is stronger. 120ug is kinda light tho assuming 1tab=~100ug on average, tho I remember seeing a DEA document with various tab samples from across time, and LSD in the 60s-70s was like 250ug/tab, with it progressively dwindling to 30-70ug on average by the 90s.
but I mean, if you've never done LSD specifically before, I think 120ug should be fine assuming that translates to about one to two hits of whatever I've got.