Not sure what the question was/is but if the question related to calculating combat resolution then yes, combat resolution is calculated by the number of wounds inflicted including instant death situation.
So if a model suffered instant death and then the total wounds remaining on that model would be added to Combat Resolution.
Space Marine Captain (has a total of 3 wounds) has 2 wounds remaining is killed via instant death than 2 wounds would go towards the Combat Resolution.
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