Why do some component codes in the entries booklet and timetable not match the component numbers in the syllabus?

We operate a system of entry or option codes based on location. In practice, this means that the component number given in the syllabus will not always match up with the component code on the timetable or in the Cambridge Guide to Making Entries. When the component code has two digits, the first digit is the component number given in the syllabus e.g. Paper 1 or Paper 2. and the second digit is the variant specific to your administrative zone. For example, component 23 is the third variant of Paper 2.