Given the following passage "Around the 14th century, there was little difference between knights and the szlachta in Poland. Members of the szlachta had the personal obligation to defend the country (pospolite ruszenie), thereby becoming the kingdom's most privileged social class. Inclusion in the class was almost exclusively based on inheritance.", answer the following question. Note that the answer is present within the text. Question: What kind of difference was there in knights and the szlachta in Poland?
A:
there was little difference