Generally, many have performed sharanagati in our households and hence we do not know the major differences. All have done sharanagati. We do the 13th day Apara Karyam considering that everyone had performed sharanagati and had attained the divine feet of Acarya.
Subham is also applicable for non-prappannas; seva kalam can also be conducted for them. By practice we say one has attained the holy feet of Acarya; and for those who have not done sharanagati, will take re-births.