Compare the voyages of non-european people before 1500 to those of the portuguese and spanish from 1400 to 1550. in what way were the voyages and their effects different?

The voyages of the non-European people before 1500 were mainly voyages that were taking places in close proximity to the already explored waters and near the continental mainland, so we can consider them as voyages with lesser risk and lesser ambition.

The voyages of the Spanish and Portuguese from the other side, were voyages that were taking place in places that were not explored before, in unknown waters and passages, as well as taking risks by going in total opposite direction from what was known and trying to find routes that were unimaginable till then.

secretly cooperate with one another.