In theory it should not affect the first case, since the driver (and/or his insurer) in the first case owed you compensation based on what happened at that time--later-occuring events do not affect liability or the compensaton owed, which is based on the injuries you suffered, car damage you suffered, and costs incurred.But if you have not yet come to an agreement about the compensation to which you would be entitled, it is possible that the other side will try to claim that some of your injuries actually came from the later accident and you're trying to get them to pay for later-occurring injuries. They become more skeptical or suspicious of your damage claims, and so this may complicate settling. You may have to go to greater lengths to prove what injuries or costs, etc. where incurred when.