Dies of "ADA4610-2" and "ADA4610-2BF"

Dear Sir/Madam,

 

  I know that "ADA4610-2" is a commercial grade dual opamp and "ADA4610-2BF" is a space grade dual opamp.

  My question is,  are the dies of ADA4610-2 and ADA4610-2BF same or different?

  If the dies are same, is the only difference the package?

 

THANKS!