Galaxy watch 6 has a new quick release style with a single button, and even more overhang under the lugs. Seems to still be the same 20mm width, so should be compatible
Samsung Galaxy Watch 6 Extreme Sport Band (20mm) M/L Lavender/White
Silicone Sport Replacement Watch Band for Samsung Galaxy Watch 5/Watch 5 Pro,20mm Soft Adjustable Strap for Galaxy Watch 4/Galaxy Watch 4 Classic Women Men - Walmart.com
Amazon.com: 20mm Band for Samsung Galaxy Watch 5/Pro 45mm/Galaxy Watch 4 Band 44mm 40mm/Galaxy 4 Classic 46mm 42mm,Soft Silicone Sport Strap Wristband Women Men,Olive Green : Cell Phones & Accessories
20mm Watch Straps Compatible with Samsung Galaxy Watch 5 40mm/44mm,Watch 4 Classic 42mm/46mm,Galaxy Watch Active Band Soft Silicone Sport Wristbands Watch Strap (Watch is NOT Included) (#5,Size Small) : Amazon.in: Electronics
Universal Magnetic Samsung Galaxy Watch 6 Pro/6/6 Classic/5 Pro/5/5 Classic Dux Ducis Strap (20mm LD Version) - Black/Yellow - B2B wholesaler.hurtel.com