I have 1.02 WE installed. From the troopstats.txt I get:

Charge bonus: -6 - 12
Melee bonus: -6 - 12
Defence bonus: -6 - 12
Armour level: 1 - 12
Honour level: -4 - 8
Ammo ( arrows or bullets ): 0 - 255
Unit size (based on 60)

Yari Cavalry ... 15, 1, 2, 3, 4, 0, 60; March, Run, Charge (1-24) = 8, 24, 28.8

for comparison:

"Light cavalry" ... 20, 4, 1, 2, 8, 0, 60; MRC = ?, 12, ?

Naginata Cavalry: 11, 4, 1, 4, 8, 0, 60; MRC = 8, 22, 26.4

'Honour' = morale. Engine is different so can't really compare directly, but it does look like the "Light Cavalry" is more offensive, more like the nag cav from 1.02. I've forgotten what the spear bonus etc. is in the old game--buried in some of Puzz's posts in the old dojo somewhere.

I'm curious about how it compares to the original (1.12) non-WE/MI edition YC too. My disk is loaned out atm but but I think some others here have it.