Love Destiny

Both main leads are from the modern times, transported/ time traveled back in time. The person/identity they’ve become in that timeline are not on good terms with the other main leads but will eventually win their hearts because of their new personality. Some of the characters on both dramas features real life figures from their respective countries, both dramas also have political aspects.

Both main characters travel back in time (though to vastly different time periods) and fall in love with someone of that era.

The main lead of both these drama's are doctor and time travelled to the past to solve some unfinished wishes .

Both main lead's time travelled to past and find their true love.They both went back nearly four hundred years to the Ayutthaya Kingdom. We might able to see the Ayutthaya culture in those dramas.

This one is basically the straight counterpart of it. They have the exact same title and almost identical plots. In both dramas the MCs travelled to the past and landed in bodies that were connected to the MLs, either through betrothal (in this one) or through a friendship ritual (in the recent Love Destiny).

In both shows, the main leads travel back in time and find themselves falling in love with the second male lead.

It's a historical romance, although not a time-travel one.
The show has just started airing, but similarities include political intrigue, class differences, and the historical setting.