FL got swapped from birth
one ends up in a rich family, other in poor
antagonist tries to prevent FL from finding happiness
foster mother mistreats FL after she finds her biological daughter
biological mother of FL also mistreats her daughter
female leads fight for the same man
step-brothers compete for their dad's inheritance

Similarities:
both FL are lost by their mother
mother adopts another child but everyone thinks they are related by blood
FL is being taken care by a happy,warm but not so wealthy family
antagonistic sister will do anything to prevent real mother meeting daughter
sister tries to steal everything that will make FL happy
Differences:
A tale of two sisters focuses more on the family problems than romance
production not that great, but story makes up for it
there is no heir involved. Instead of embroidery it shows announcers