A registry book number (i.e. 44B) might exist in multiple, or every, British colonial registry. Each of those could have identical page numbers.
What would set them apart is the location of the registry office, and the contents of that particular page at the different offices.
"44B" obviously refers to a registry or "Birth" documents. It is highly likely that births were occurring and being registered at a variety of British colonies (possibly at every single colony).
Of course. But the sequence of books in South Australia reached book 44B roughly around 1959-1964. How can the set of registry books in Kenya reach the same number at the same time? That beggars belief.