You Do Need power plug adapter while traveling from Mexico to Liechtenstein.

Here is Why You Need An Adapter

The outlet and plug type used in Liechtenstein are C and J and in Mexico are A and B. This is how they look like.

Mexico

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

Type A

Type B

Liechtenstein

In Liechtenstein, outlets of type C and J are in use.

Type C

Type J