You Do Need power plug adapter while traveling from Pakistan to Cambodia.

Here is Why You Need An Adapter

The outlet and plug type used in Cambodia are A, C and G and in Pakistan are C and D. This is how they look like.

Pakistan

In Pakistan, outlets of type C and D are in use.

Type C

Type D

Cambodia

In Cambodia, outlets of type A, C and G are in use.

Type A

Type C

Type G