two sides of the same coin
Noun
Meaning
Two aspects of the same thing.
Low income and poor health are two sides of the same coin.
Two things that superficially appear to be opposites but are fundamentally similar.
Source: en.wiktionary.orgSynonyms
Examples
The German Reunification and unification of Europe are two sides of the same coin.
Peace and justice are two sides of the same coin.
Nazism (national Socialism) and communism (international socialism) were but two sides of the same coin.
Fantasy is an area where it is possible to talk about right and wrong, good and evil, with a straight face. In mainstream fiction and even in a good deal of mystery, these things are presented as simply two sides of the same coin. Never really more than a matter of where you happen to be standing.
If you exchange information internationally, you must strengthen data protection. Those are two sides of the same coin.
Faults and virtues are but two sides of the same coin.