Hi Charley,
Well, I'm not 100% sure, of course, but the black projectile doesn't look Japanese (the driving band and overall shape looks 'wrong'). The 47mm with corrugated Hotchkiss band may be Japanese (although almost all of the Japanese ones in this calibre are of the APHE kind, instead of the HE kind). Are there any markings on it? Particularly, a small anchor on the driving band and/or the typical IJN acceptance mark under the driving band?
If not these, are there other markings on it?
As for the black one: no idea where it's from....
Cheers,
Olafo