John Bullitt has started based on the SLTP edition, Sri Lanka, which is on certain places different, and also the PTS edition he used, is different, but it is possible that CSCD is similar to the Thai Edition which he market also.

The suttas are numbered here by nipata (book) and sutta, with the suttas numbered sequentially from the start of each nipata, using as a guide the Woodward & Hare PTS English translations of the Anguttara Nikaya (The Book of the Gradual Sayings). Because suttas in the Anguttara have often been numbered inconsistently in different Tipitaka editions and translations, I have also provided alternate reference numbers in the braces {} that follow the sutta descriptions. For all suttas, these alternate references include the volume and starting page number in the PTS romanized Pali edition of the Anguttara Nikaya (example: A i 60 = PTS Anguttara Nikaya volume one, page 60). For suttas in the Ones and Twos, whose numberings are particularly problematic, I have also included the nipata, vagga (chapter), and number of the sutta, with suttas counted from the start of each vagga (example: II,iii,5 = Book of the Twos, third vagga, fifth sutta).

Note

1.The exact count of suttas in the Anguttara depends on the particular edition (Sri Lankan, Thai, or Burmese) and on the way the suttas are enumerated. Jayawardhana says: "Although the text tells us that it consists of 9,557 suttas, the present edition [the modern Sri Lankan Tipitaka] has only 8,777 suttas. Most of these suttas are mere repetitions with a new word added here and there. Therefore, the number of suttas distinctive in character could be brought down to a little over one thousand" [Somapala Jayawardhana, Handbook of Pali Literature (Colombo: Karunaratne, 1993), p. 12]. Bhikkhu Bodhi counts 2,344 suttas [Nyanaponika & Bodhi, Numerical Discourses of the Buddha, p. xv], while Webb counts 2,308 [Russell Webb, An Analysis of the Pali Canon, (Kandy: Buddhist Publication Society, 1975), p. 26].

Njom Norum can see that in the Index for Example:

AN 3.51: Dvejana Sutta — Zwei Leute (1) | Zwei Leute (1) {A i 155; Thai 3.52; BJT 3.52}

or at the head of the single Sutta pages

AN 3.51 PTS: A i 155 Thai 3.52; BJT 3.52
Dvejana Sutta: Zwei Leute (1)
übersetzt aus dem Pali von
Thanissaro Bhikkhu

Only Jataka has also the CSDC numbering remarked for now on ZzE, but it possible all Suttas will also get the CSCD an Khmer numbering (book, page) later.

So it can be different, but as it also can be wrong and different on single places, its good to check and remark it if seems so.

More about the Numbering on ZzE: Sutta-Referenzzahlen