There is no time difference between Brussels and Amsterdam. Both cities use Central European Time (CET, UTC+1 in winter and CEST, UTC+2 in summer). When it's 9:00 AM in Brussels, it's also 9:00 AM in Amsterdam.
Both cities observe daylight saving time on the same EU schedule, so they remain synchronized year-round.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 5:00 PM) without any time conversion needed.
Brussels and Amsterdam are neighboring capitals connected by high-speed Thalys trains taking about 2 hours. Both are major European business hubs with the EU institutions in Brussels and many multinational headquarters in Amsterdam.