Originally Posted by dusdidt
You would get same miles as it were two flight numbers but probably one segment gain.
Wow.
Check here, then strap on your Gold Elite flame-suit & be prepared to get an education on 'minimum milage'. OP's original itinerary would have scored 1000 base EQM/RDM and 2 segments for the one-way.
OP might look into snagging a standby seat on an earlier-departing (and different-numbered) flight.