As Peter has pointed out, the set/unit numbers (2200xx/2211xx in this case) are carried at both ends as these numbers refer to the whole set/unit.
The five digit 6xxxx numbers are coach numbers. Each coach has its own number in TOPS. MU coaches all have five-digit numbers, whereas LHCS may have shorter numbers. MU unit numbers are all six digits long.
For example, Class 153 units, despite comprising of only one coach, all have a six-digit unit number (1533xx), as well as a five-digit coach number (523xx or 573xx).