You Do Need power plug adapter while traveling from Israel to Equatorial Guinea.

Here is Why You Need An Adapter

The outlet and plug type used in Equatorial Guinea are C and E and in Israel are C and H. This is how they look like.

Israel

In Israel, outlets of type C and H are in use.

Type C

Type H

Equatorial Guinea

In Equatorial Guinea, outlets of type C and E are in use.

Type C

Type E