Indeed, with some similarities, but also with some differences as well, as was discussed in a subdiscission on thread you started on DhammaWheel, if I may move a few quotes from there to here:
Thai forest meditation generally begins with Buddho. The two syllables, Bud and dho, are coordinated with the in and out breath, respectively. The student is directed to maintain concentration on the coordinated breath/sound to the exclusion of all other thought and sensory input. Samadhi, concentration, lays the necessary foundation for wisdom, panna. It is argued that without the penetrative power of samadhi, insight can only be shallow. The practice of Buddho is near universal among forest monks. While other methods are suggested, the recitation of Buddho is the favoured object of sitting meditation. Ajahn Chah for instance recommends that at the commencement of a meditation period a body scan is helpful; nonetheless, he continues to advocate Buddho as the primary practice. This is evident in his instructions to a dying lay follower as he urges her to let go of all concerns and just be with Buddho (2002, p. 323).
The work Meditations on the Word Buddho for Beginners (2015) by Chaiwutimongol is one of the few in print discussions of this primary practice. A progressive set of levels of Buddho are prescribed beginning with coordination with the breath. The mantra is eventually located in the heart or the solar plexus region. The systematic presentation by Chaiwutimongol fills in gaps in our knowledge, but it may be misleading. The researcher never encountered such an orderly or thorough practice of Buddho. This presentation may be an ideal composite. Nevertheless, in the field, Buddho was practiced to establish basic samadhi.
Once the mind has become unified with Buddho/breath, the practice becomes more subtly and even divergent. The attainment of a stable absorption in Buddho is a critical junction and signals a higher level of practice.
(Alan Robert Lopez, Buddhist Revivalist Movements: Comparing Zen Buddhism and the Thai Forest Movement, 61)
The linking of the recitation of the name with, specifically, what seems like an adaption of basic Buddhist breath-observation, is a characterizing feature, it seems by the above, of the Thai Forest practice of Buddho-recitation. I have never been instructed in the practice and am poorly exposed to it, is the above an inaccurate presentation of at least a cursory glance at the practice?
It would be interesting to see if Pure Land developed a similar practice of recitation combined with a meditative practice, it would be even more interesting if that specific meditative practice involved observation of breath or breathing.
What is similar, though, between Buddho-recitation and niànfó, and aside from the more obvious similarity of them both being ‘conceived of’ as forms and/or methodologies of buddhānusmṛtayaḥ (recollections of the Buddha), is that they both seem to incorporate a certain amount of non-dual teachings between the practitioner and the object of practice.
In niànfó, the mind becomes ‘unified’ with Amitābha Buddha by virtue of, ultimately, being Amitābha Buddha, in a manner of speaking and from a certain perspective.
In the above quotation from Lopez, if it is correct with regards to Thai Forest tradition teachings/practices, the “mind becomes unified with Buddho”, which is understood, it seems, as ‘identical’, in one way or another of reckoning, to the very breath involved in the uttering the word. It would be interesting, from here, to see how they further differ and correspond.
Lastly, is this conducive to the OP and in agreement with the intentions of the thread regarding the OP, or should this reverie into niànfó-Buddho comparatives be its own thread? If it is contrary to the wishes of the OP or the forum to have this subdiscussion here, it can be moved to its own thread, or deleted, but I think it would enrich the general conversation personally.