Why  Barcelona and Ajax look and feel the same on the field? 

Futbol Club Barcelona, commonly referred to as Barcelona and colloquially known as Barça, is a Spanish professional football club based in Barcelona, Catalonia, Spain. 

Amsterdamsche Football Club Ajax, also known as AFC Ajax, Ajax Amsterdam, or simply Ajax, is a Dutch professional football club based in Amsterdam, that plays in the Eredivisie, the top tier in Dutch football.

Christopher Johnson from Tokyo, Japan, CC BY-SA 2.0 , via Wikimedia Commons