Galaxy Watch 42 mm on the left. Galaxy Watch Active 2 44 mm on the right. Shown here with their default bands but I wear the GWA2 with the band from the
Amazon.com: Compatible for Samsung Galaxy Watch 4 Classic 42mm 46mm,Galaxy Watch Active 2 40mm 44mm,Galaxy Watch 4 40mm 44mm Girls Women,20mm Quick Release Smart Watch Band for Watch 3 41mm/Watch 42mm/Gear Sport :