Funny how developer edition really as the EE engine and yet it is being upgraded to standard
At any rate since you are updating the engine, everything else should be ok if left as is.
I'm sure you already saw this link, but I'll add it for others.
Version and Edition Upgrades
I would doublecheck the upgrade of Developer to Standard just incase SSRS and SSAS complain during the upgrade.
Just my $0.02