The MCT oil ( caprylic acid C8 & C10) are extracted from coconut oil (or palm) to make MCT oil.
The "remains" are typically higher melting point which is why coconut oil is solid or a fat at room temp. MCT is free of these which is why it is liquid at room temp.
So ... Coconut oil would not make a good carrier for IM injections, MCT (from coconut) is much more suitable.