[Both] of the MCs reincarnated/hibernated in the future, both disappointed due to the decline of their respective specialty and in turn seek to develop it. Yes, both of them are OP af. [Both] of them are deeply connected to the timeline's individuals as their predecessor and they have to adapt on different lifestyle. A Time-based Cross Cultural Pollination [Both] of them are taken care of by a family after their reincarnation.
If you liked
Saikyou Mahoushi no Inton Keikaku
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...then you might like
Tensai Ouji no Akaji Kokka Saisei Jutsu: Souda, Baikoku shiyou
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[Both] of the Protagonists have a huge responsibilities, (Wein) being a prince and (Alus) being a greatest magicmaster, but despite that they both wanted early retirement and find ways to avoid their duties. [Both] of them do their responsibilities anyway and're actually doing an excellent job. [Both] have harem potential but despite that, the still series doesn't have much of a romance. If you hate it, this might be for you.
If you liked
Isekai Tensei Soudouki
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...then you might like
Genjitsu Shugi Yuusha no Oukoku Saikenki
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[Both] of the novel is focused on Expanding the Kingdom, though the only difference is that --Isekai Tensei Soudouki- started from scratch whereas in the -How a realist hero rebuilt the kingdom- the crown and kingdom itself was given/shoved on MC. [Both] of the novel expand their political ties with the other existing kingdoms/empire and MC's are actively leading a war if needed, though the -Isekai Tensei Soudouki- MC is more physically active due to his blood and expertise in swords, while the -How a realist hero rebuilt the kingdom- MC has limited power and focused on pen/diplomacy. [Both] of the MC has multiple partners (harem), some politically, some personal. And both has their female leading casts' supports the MC and have their own contribution to the improvement of the kingdom. The internal family issues isn't explored making it a wholesome and relaxing read.