A Catalina 25 -20 years old with a relatively new outboard that starts shouldn't have a lot wrong with it.
The keel bolts should not look like rusted snaggle teeth and the shroud swages should not be cracked or bent.
These conditions are more common to 20+ year old models.
A survey, regardless of who commissioned it, is only as good as the surveyor!!
Since there are few major components in a vessel of that class, a rigging survey (aloft) may be more valuable.