DS26F32MQML-SP: Information about the EM version of this component

Hello team,

I am looking into using the DS26F32MQML-SP / DS26F31MQML-SP pair for a space project. 

What I would like to understand is if there is a correspondent EM (Engineering Model) part which I could select for my EMs or if I should just choose the same part for both the EMs and the FMs (Flight models). (please note that the EM and the FM should have the same package, if possible)

This question can also be phrased more generally: for the majority of the TI space components there is a clear difference between the FMs and the EMs parts, but for some of them this distinction is less clear. Is there a general philosophy behind this apparent lack of information?

Thanks a lot for the help

best

Francesco