The key part is less the fuses, and more the clock source. The ceramic oscillators that sanguinololu uses aren't brilliant (compared to a crystal) and the only thing that differs (besides frequency) is the clock drive. Ceramic oscillators are a bit unstable and therefore start faster, but have lower drive values. Crystals are more stable, take a little longer to get going but have very good drive values.
Read back the fuses that you used originally, then set matching fuses (not values, tick the appropriate boxes int he engbedded calculator) and you should be fine. The 1284P is not a specific speed chip, it'll work on a variety of speeds, so long as you match the clock inputs correctly (usually).
Read back the fuses that you used originally, then set matching fuses (not values, tick the appropriate boxes int he engbedded calculator) and you should be fine. The 1284P is not a specific speed chip, it'll work on a variety of speeds, so long as you match the clock inputs correctly (usually).