The one with the 'bulb' is defintively a thrusting spear. These were used to stab through the wicker shield of the opponent. This type of spear always has a very massive spearhead.
The blade type of your spear is somewhat different, but I wouldn't be bothered with that.
Here are some spear from my collection which have similar shafts.
I also added a couple of pics from the book 'Waffen aus Zentral-Afrika' (Weapons from Central Africa) from the Ethnographic Museum in Frankfurt am Main (Germany).
You can notice that these have the same 'butt'.
