Looking for a clear explanation...

[Imp]

Weapon Data
KILL - Rating vs soft targets first number is using HE
2nd number if one is for other ammo types generally.

Soft targets are unarmored so trucks & troops the higher the kill the more damage you are likely to cause more damage so 2 dead instead of 1.

It has absolutley nothing to do with a weapons effects vs a vehicle unless it is unarmored.
The ratings under PEN HEAT & APCR are what is used vs armour if you reread my post.

Vs Armour you compare the above ratings against the armour ratings allowing for range.
Example
Ignoring range
50 AP or APCR will defeat lower rated armour 1-49 but bounce off higher rated armour 50+
Dont worry about anything else thats the basics.

There is a bit of randomness so if the 2 ratings are close it may still survive or just be damaged rather than destroyed.