The most recent update on the release schedule for IWM, both confirmed items & potential items...the Primitive Crossbow was not on it....
As far as which one is which, currently the one featured in TRO: 3075 is available, and is the one in the image below...
As far as the Primitive Crossbow, that is not available, which is the one featured in XTRO: Primitives Volume 2 and is in the image below...