I've been checking my books and found this in 'Waffen aus Zentral-Afrika' (Museum für Völkerkunde, Frankfurt am Main - 1985) :
A similar blade as spear blade #1 can be found on page 189, fig. 226. According to this book it is attribuated to a tribe in Eastern Congo (Nsakara ?).
The other two blades #2 and #3 could be from Northern Cameroon. If you look at page 160, fig. 163, you can see the similarity in decoration on the spear blade in the book and on your two blades.
The book gives no further details.
I hope this helps ?