BLAST-FASTA - (Oct/29/2015 )

Is there any sequence that cannot be found on BLAST but not FASTA or vice versa?

FASTA is a sequence format where the sequence and associated text forms a specific layout (60 characters per line, leading lines start with particular symbols etc.) BLAST is "Basic Local Alignment Search Tool" a program for  searching for similar sequences... there is no comparison between the two, as they are two separate things.