One Bride for Another by Marcela Citterio

The downside of being lent a life is that sooner or later, you have to give it back  
Two failed weddings, two brides running away from their own insecurities and fears. On a rainy highway, an accident brings them together in the most unexpected way. 
Laura, a luxury bride with an ostentatious wedding filled with wealthy guests, and Venecia, a humble bride planning a small ceremony in a guestless chapel. Two opposite worlds collide in that instant. Both overwhelmed by uncertainty, they decide to run away. Two strangers facing each other, yet sharing the same feeling of disorientation. Amid chaos and crisis, a bold idea emerges: to swap lives. One bride for another. An exchange that comes with unpredictable consequences. 
In this story of chance encounters and profound transformations, they will discover that the true power to change lies in their own hands—and that destiny can deal the most unexpected cards. Because when one person changes, the world around them changes too.