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[Endophyte]

Mescalero
The plant you show does not look like the Predominant Cultivar of Trichocereus pachanoi.
It does look like a different type of pachanoi and probably is, but could also be a hybrid involving pachanoi and another landrace form.
The identification of San Pedro cacti via images is inherently problematic and is far from an exact science.

Take the pachanoid clone Juuls Giant for example. In the past people would post a photo of a Juuls-like plant that lacked ID and then some so called expert then identified the plant as Juuls and then it gets that label and gets traded under that name but it isn't the Juuls clone at all. Now there are lots of distinct clones with bad ID that are mislabeled because of this.

Even the idea that an expert can ID the plant you show to pachanoi is problematic.
I have seen lots of hybrids that look like pure species.

So sure the plant you show is probably pachanoi and doesn't appear to be the PC clone, but if I told you it was clearly pachanoi and that you should label it as such, that would be idiotic.

This is why categorical names were employed like Bridgesiioid, Pachanoid and Peruvianoid etc. They indicate that a plant appears to be allied with the species named, but avoids making the claim that the plant represents the species. The same type of logic is used in chemistry, Cannibinoid, Opioid etc.

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[modern]

Now a days especially with breeders using PC pachanoi in their crosses the identification of PC has become nearly nullified.

To me the pachanoi in the far right is the only one that is "non-pc" as the top growth shows a more rounded growth were as pc tend to have more pointed growth. The blue skin has to do with lighting IME and even the classic PC clone shows it depending on the growing conditions.

It is possible that these three cacti are all the same clone and it is just a difference in maturity and growth conditions.

PC clone tends to get a bad rap however it is actually more reliable then Peruvianus cacti. PC clone has very rapid growth and is very tolerant to unfavorable conditions. Biomass/Content ratio is quite important factor that most ignore.

Endophyte is correct though that visual appearance isn't a great reference and as hybrid are not pretty commonly sold and traded it should start to be fazed out.