Abortion and war do have similarities.
Abortion has a child smack dab in the middle of the crosshairs.
Just war has uninvolved, and presumed innocent, civilians off to the side of the scope with unjust aggressors smack dab in the middle of the crosshairs.
That is about as similar as dissimilar can be.
Those killed in war have been experiencing this human environment. Those who have been aborted were virtually unaware of this human environment and since I believe that God is infinitely more powerful than mankind, I believe that if that unborn child is meant to be here, that will happen in one way or another.
I don't believe that our existence starts when an egg is fertilized - that is a human function; God is spiritual and He is our Source, not a material human function. Likewise, I do not believe our existence ceases when we experience human death. If we are eternal (as God's children were created) then we have no beginning and no ending - only changes of environment and experience, ultimately realizing our spiritual nature.