I doubt life could evolve in space, only on planet surfaces
And in that case, I doubt even the most robust germ would survive the impact that hurls debris into space at escape velocity. And I doubt even more that it would survive a second re-entry and impact onto another planet's surface. And I really really doubt that it would then survive an alien environment, totally contrary to the conditions in which it originally evolved, to take root and survive even more.
There is something fishy about this whole idea. It is indeed the Salmon of Doubt that I smell.