ANy evolutionary path that starts in a universe governed by certain constants -- such as the relationship of mass to gravity, the speed of light, and the nature of acceleration, just for examples -- is likely to face the same broad categories of hurdle that critturs here do--collisions, explosions, eaters of various kinds, the boundaries of liquids, solids and gases, and so on. So even a silica-based life form has a certain number of possible evolutionary trails to take in the quest for survival and sexual selection. The mechanisms of our parts have also proven adaptable to many changing conditions.

Given these things it make sense that life forms will develop eyes, fingers, opposable thumbs, jointed limbs, and that evolutionary forces will favor those who are built to deal with the rocks and shoals. The primate body form is a beautiful combination of levers, lenses, springs, switches, and chemistry which has proven all its bits and pieces over millennia. So I don't see why other life forms believed to travel interstellar distances (which presumably means they have conquered energy systems and synthetic environments) should not be somewhat similar.