It depends on the size of the biological matter.
In space you have mainly two factors of hostility:
- extreme temperatures
- radiation and energetic particles
Extreme temperatures are dangerous for preservation only on the hot extreme, since they break down organic molecules into smaller components. When they are on the cold extreme they are advantageous. Deep space frozen matter doesn't change that much, so the same holds for organic matter. If the freezing is slow, you might get collateral damages by the formation of ice crystals. Here size matters: the bigger the sample, the longer it will take to freeze, as the only way to lose heat in the vacuum of space is by radiating it. And the longer it takes to freeze, the bigger ice crystals can form.
Radiation and energetic particles instead bring damage whenever they interact with matter, including organic matter. Since the damage is dose dependent, and the absorbed dose increases with the volume of matter, it follows that the bigger the sample the bigger the damage. So, a human body might get more damage than a bacterial spore. Moreover, a human body is a tad more complex than a bacteria in its working, therefore it's also more sensitive to damages, simply because there are more mechanisms that can get broken.
Would the bodies of these life forms still be intact inside of their spaceships in the cold depths of the void?
Completely intact no, they would be frozen and dehydrated, resembling an Oetzi. However, they would not be rotting away, in reason of their frozen status. caution should be exerted on handling them, as they would be extremely fragile.