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

Here is Why You Need An Adapter

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

Cambodia

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

Type A

Type C

Type G

Nicaragua

In Nicaragua, outlets of type A and B are in use.

Type A

Type B