Maybe. It depends on your insurance company and whether or not the safe is of a variety that the insurance company thinks is good (some do have specific brands in mind). Keep in mind that certain modifications to your safe may not allow you to get discounts on the insurance. For example, fire ratings are considered invalid if you have drilled holes in your safe to bolt it to the floor or to have electrical wiring go in the safe for a dehumidifier or electrical light system. It just depends on the insurance company and your policy.
It does not matter where the safe comes from. My insurance guy likes the Sentry safes for paperwork because he says they work really well, but those are only for fire protection, not security. So, talk with your insurance agent. Find out what would or would not qualify and be sure to find out about modifications.