Both features mature ladies who had a clear view of what they wanted and were very good at what they did.

The male and Female Lead of both dramas are the best at what they do. Both are smart, calculative and all

If you enjoy A Journey to Love, then check out Who Rules the World. Male and Female lead were the best martial artists in both dramas.

In "King is not easy" the Body Swap is between a king and a servant
In "The Trust/No Doubt in Us" the Body Swap is between the king and the Queen

Both are similar in the aspect where the sisters swapped when it was needed to defend the one who was been bullied.