Power dissipation versus power consumption
Consumption is really not a good term to use for power, but it probably refers to the power input to the device under consideration. Power dissipated probably refers to the losses associated with the device that are usually dissipated as heat. The output power of the device is transferred elsewhere in some useful form. The losses are calculated as input power minus output power.

It may be difficult to calculate loss dissipation from data sheet information. The input power listed in the data sheet is usually the maximum value that may not occur under normal operating conditions. The output power is usually the maximum value that can be tolerated continuously under the most adverse permissible values of other conditions such as input voltage and ambient temperature. Depending on the purpose of loss dissipation, you may want to consider either typical actual operating conditions or worst case conditions.