Actually, the P-38 prototype had counter-rotating props,but the a/c suffered from vibn/resonance/something nasty,so pre-prod/prod went non handed.
The Hornet (Aahh,DeHavilland) was handed,props turning inboard from the top and looking forward. The Gannet has/d counter-rotating,2 engines,separate drives; the Shackleton and Bear both had/have contra-rotating props,as did late Spits/Seafires/fangs/RedBaron ie engine drives both props thru` the gearbox.
And if you read the A400M blurb, it has counter-rotating props on each wing,ie inboards go one way ,outboards t`other way....all to do with downwash/slipstream.....Syc