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_416 ( id number, "chip" text, "flash size" text, "eeprom" number, "sram" number, "frequency\n[mhz]" number, "package" text )

### Question ###
what is the flash size difference in the at90s8515 chip and the at90s4414 ?

### Accurate SQL ###

SELECT ABS((SELECT "flash size" FROM table_204_416 WHERE "chip" = 'at90s8515') - (SELECT "flash size" FROM table_204_416 WHERE "chip" = 'at90s4414'))