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You would think, if the two batteries are at a different state of charge/cycle, the unit with the greatter charge may be overcharged and therefor damaged. This is due to the charger not being able to sense that one of the batteries is overcharged.
Flying fish, I'll go back to my pressure analogy, overcharging is like overpressurising a gas cylinder. Unless the pressure (read voltage) is too high then there will be no overcharging.
As the charge in the battery increases the current flowing in will decrease.
The sensing you refer to is usually simply no more than the charger limiting the max current flow until you get to the point where the voltage of the battery is high enough to hit what you would refer to as a fully charged battery. If the charger is set up for the correct voltage thenthe charge current would just slow to a simple trickle charge at this point. A battery with the correct voltage on a charger will simply not overcharge. Not saying all chargers are set up right though!!
If the voltage on the charger was set to be the same as the fully charged voltage (as shown in the earlier table) then in theory the charge would cease at this point. In reality the voltage is usually fractionally higher and a trickle charge happens.
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