Genjitsu Shugi Yuusha no Oukoku Saikenki Part 2

Both shows main focus are economical and political aspects of managing kingdom in a fantasy world, we follow protagonists, that try to make world they live in a better place. Also both shows feature wholesome romance elements. 

Similarities: Both Sasaki to Pii-chan and How a Realist Hero Rebuilt the Kingdom delve into the complexities of political climates among high roles in society. They feature protagonists who strategically navigate societal hierarchies and leverage their knowledge to influence their worlds. Additionally, both series explore the operations of private government organizations, where confidential information and strategic decisions are pivotal. Differences: Sasaki to Pii-chan focuses on economic strategies and interdimensional trading as the protagonist builds wealth and tackles business challenges across different worlds. It emphasizes entrepreneurial pursuits and integrating modern knowledge into diverse societal frameworks. On the other hand, How a Realist Hero Rebuilt the Kingdom centers on a protagonist who takes leadership of a kingdom, implementing pragmatic reforms and handling political intrigue to ensure stability and prosperity. The narrative revolves around statecraft, diplomacy, and modernizing the kingdom amidst internal and external threats. In both series, navigating political landscapes and managing confidential information are central themes, offering distinct perspectives on governance and societal dynamics in their respective fantasy settings. read more 

Both have kingdom building and are isekai characters who are the rulers of their respective nations. in both slime and realist hero they are very diplomatic in running their nation and believe in development of their nation. 

Elisa Magic Ability = Shamna Geass, it's a similiar things that you can bring memories back to the past 

Characters in both anime solve various economic and political problems in their countries, main difference is the motivation of main character, because one of them is doing this more willingly than the other. Both anime should have "economic/political" tag in the genre. 

Main protagonist is transported to another world, where in one of them it's literally a game and another is more "realistic" fantasy world. In both shows plot follows how main characters solve various economic and political problems in the world they are in. Despite difference in setting both shows are very focused on the "economic" aspekt of story. 

Both anime focus on economical and political aspects of the kingdom, both have romance elements and feature fantasy world with magic present. Main difference is in one of them we follow genius protagonist and in another we follow fiance of young genius prince that is supporting him.