SIMILARITIES:
1> In both dramas there is a body switch.
2> In both of them the main male leads live the lif of each other.
3> The body swap occurs due to an accident.

DIFFERENCES:
1> In TDOBY the lead couple goes through the body swap whereas in KRSC the main male leads go through it.
2> In TDOBY body swap occured due to the accident in lift whereas in KRSC body swap occured due to traffic tragedy.