From the left, we have the Hanwei replica of the British 1868 head (and butt). This is still used by the RCMP (the Mounties). Next are 3 British-style lance heads. I'm told these are from India, under British rule. Similar to the Hanwei, but a bit fatter and shorter. The sockets on these are threaded (see detail pic). The middle one of these 3 has been repaired, apparently with the head being welded back onto the socket after being broken off. Which suggests that these were actually used, perhaps for tent-pegging (as RCMP lances are still used today).
Next two shorter ones. The first of these is flattened diamond cross section, and the second is hollow-ground triangular (like all the rest, except the immediately previous head). The cross-sections of all are shown in a pic. Perhaps the diamond-section one is a pike head, rather than a lance head.


Western lance heads


cross-sections


screw-thread sockets