You Do Need power plug adapter while traveling from Peru to Bolivia.

Here is Why You Need An Adapter

The outlet and plug type used in Bolivia are A and C and in Peru are A, B and C. This is how they look like.

Peru

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

Type A

Type B

Type C

Bolivia

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

Type A

Type C