The "unknown" looks like a "Cereus Peruvianus" and is inactive.
The "San Pedro" looks like a hybrid of "Trichocereus Bridgesii" or "Achuma", which in my experience is one of the most active.
I recommend cutting about 12" off your cactus, make some syrup and give it a whirl.:lol:
In my opinion it does not look like an active plant, but looks like a sun starved cuzcoensis type. However without having seen it grown in brighter conditions it cannot be identified by me.
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