The most accurate comparison regarding the impact of global trade on the Swahili coast and the Kingdom of Kongo during the seventeenth century is:
The Kingdom of Kongo lost control of the slave trade, while the Swahili coast lost its power to extract resources.
During this time, the Kingdom of Kongo faced increasing pressures from European powers and internal divisions, which undermined its control over the lucrative slave trade. Meanwhile, the Swahili coast's traditional trade networks became disrupted by the Portuguese and other competing powers, diminishing its ability to capitalize on regional resources.