The refrigeration unit power Consumption varies according to many things, for an example:
1- The refrigerant, as each refrigerant has it own operating head pressure.
2- The condenser cooling medium.
3- The compressor type, Reciprocating, Screw, Scroll, Centrifugal.
4- The operating capacity, if the unit is running fully loaded or partial loaded.
5- The type of the electric drive as some times there is a Variable Speed Drive motors which reduced the power consumption a lot.
6- Is there an economizer in the refrigeration cycle or no?
7- And many others