I guess as a javelin with higher impact, less velocity and range. Damage not so sure, likely the reduced velocity would counteract the increased mass as far as penetration went.
Playing with anims at the moment. Will introduce some differences between 'lancer', 'charger' and 'brawler' cavalry. 'Lancers' will be cavalry that relies primarily on the charge and then tries to not engage in prolonged melee, eg Hussars. 'Charger' cavalry will be capable of both effective charges and melee (in the context of its time period), eg Chivalric Knights, and 'Brawler' cavalry will be kataphract style, emphasising the charge less but once in melee aggressively pushing forward into/over the enemy. There will be animation, stamina, movement rate, mount mass and attack/defense bonus differences between the three categories, also depending on unit quality - high quality and impetuous units will tend to be more aggressive. These won't be dramatic differences but will add some flavour in depicting the various types of cavalry in use at the time. This is an experimental change.
Crossbowmen and archers transition to 'ready' stance more quickly. Likely javelinmen will also, so these units should be able to start shooting a little more quickly.
Polearm stats have been adjusted, in particular the swordstaff is much more historical.
Ballista velocity increased by 10m/s and accuracy increased slightly.