Both Anadenanthera colubrina and Anadenanthera peregrina have almost always just bufotenine.
In the rare cases that DMT did appear in analysis, it has been in minor quantities.
For the most part 5-MeO-DMT has also only really been found in trace quantities, in pods without seeds, leaf, seedlings, bark and immature seeds.
The one exception has been in one publication Anadenanthera peregrina var. falcata, showing 4.655% 5-MeO-DMT in seeds (and also in pods) I tried acquiring falcata from a local supplier in Brazil as well as harvesting some myself and they only showed bufotenine. Also there are publications of other falcatas saying only bufotenine.
For 5-MeO-DMT, so far it seems Virola theiodora bark resin is the most reliable plant source we know of but it isn't available for most people.
You can look at
Trout's notes for a lot of referenced info on which plants can be found with specific alkaloids. Our wiki has a lot of that info too.
As for Diplopterys cabrerana, I think the whole 5-MeO-DMT claims are mostly myth/self-suggestion. There were several analysis showing only DMT as the main alkaloid, sometimes with traces of other alkaloids. 5-MeO-DMT has only been found in the stems, not the leafs, and even then, only in trace quantities..
I tested myself a Diplopterys leaf from a source that some people were claiming gave "dark" experiences, and it was pretty much just DMT with small amounts of fatty acids.
The thing is that Diplopterys has generally high amounts of DMT, so people might mistake an unexpected higher dosage for a different quality of experience, specially when associated with self suggestion.
It is not absolutely impossible that some rare genetics out there will allow these plants to produce more of other alkaloids but given the amount of tests done so far showing the contrary, I'd say it is unlikely.
We should do more research with potential 5-MeO-DMT plant sources that can be grown/found in different places. There was some initial indication with Phalaris "Turkey Red" strain but I haven't read reports of people having significant yields and general success with it. There may be some more common or easily grown plant with 5-MeO-DMT that would give people a sustainable access to 5-MeO-DMT. Would be interesting if we as a comunity can contribute to this research.