I didn't test with other drones, but Papillon drones have some troubles with autofit in refit screen. When ship is saved with papillon drones, and then any same ship auto-equipped with this saved variant, no drones would be in dronebays.
Another aspect of that: despite being selected in "Doctrine&Blueprints" screen, Papillons do not show up in any fleets, at all.
Also, Papillons are quite overpowered.
Lets compare them with "working horse" of bomber fleets, Dagger wing:
Papillons have 2 missiles x 600 explosive damage x 3 drones = 3600 explosive damage per volley.
Lets assume half of that is lost due to fighter and missile losses: ~1800 damage per volley for 5 ordnance points.
Daggers, for comparison, cost 18 OP and have 3000 explosive damage volley. They are sturdier and have shields, so assume ~1/3 of volley lost, that's still leaves us ~2000 volley.
By choosing Papillons, for less than 1/3 of OP cost, you can have similar volley damage, less(but not much) armor penetration and EMP effects (did a forgot to mention 1000 EMP damage per missile?). That's a no brainer, in my opinion.