Stockholm is 8 hours ahead of Mexico City
Best overlap: 8:00 AM to 10:00 AM in Mexico City is 4:00 PM to 6:00 PM in Stockholm.
For the smoothest call, aim inside 8:00 AM to 10:00 AM in Mexico City, i.e. 4:00 PM to 6:00 PM in Stockholm. The overlap barely stretches to 2 hours, so reserve it for what really needs a live conversation and handle the rest async. Note that Stockholm follows daylight saving while Mexico City stays put, so the times above drift by an hour seasonally.