Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_204_506 ( id number, "seasons" number, "team" text, "ch.wins" number, "promotions" number, "relegations" number )

### Question ###
what is the difference between the number of wins pallac . reggiana reggio emilia has had and the number of wins progresso castelmaggiore has had ?

### Accurate SQL ###

SELECT ABS((SELECT "ch.wins" FROM table_204_506 WHERE "team" = 'pallac. reggiana reggio emilia') - (SELECT "ch.wins" FROM table_204_506 WHERE "team" = 'progresso castelmaggiore'))