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_203_41 ( id number, "name" text, "variant name(s)" text, "source" text, "source coordinates" text, "length" text, "mouth" text, "mouth coordinates" text )

### Question ###
what is the difference between the length of english canyon and the length of munger creek ?

### Accurate SQL ###

SELECT (SELECT "length" FROM table_203_41 WHERE "name" = 'english canyon') - (SELECT "length" FROM table_203_41 WHERE "name" = 'munger creek')