Is it possible for 2 parents to have 1 child and a few years later have another child that look exactly the same?

Yes, it is possible for two parents to have two children who look very similar, especially if they are siblings. This similarity can be attributed to genetics, as siblings share a significant portion of their DNA. However, it is highly unlikely for them to look exactly the same due to the random nature of genetic inheritance and the influence of environmental factors. Identical twins, on the other hand, are an example where two children can look almost indistinguishable.