Yes, Denmark generally uses the same sockets as the Netherlands. In both the Netherlands and Denmark, the so-called Europlug CEE 7/16 plugs are used. These plugs have two round pins and fit into the sockets with two round contact points that are common in both countries. The voltage and frequency of the electrical network are also the same, namely 230V and 50Hz. Therefore, you usually don't need to bring a travel adapter when traveling from the Netherlands to Denmark, and vice versa. You can plug your electronic devices directly into the sockets of both countries.