Although the overall display of the newer Apple Watches is larger, the area where the strap attaches to the watch remains the same as the previous series for consistency in strap compatibility.
Apple Watch Strap Size Guide:
|Compatible size||Apple Watch Ultra||Apple Watch Series 4/5/6/7/8/SE|
|Compatible with Azmax's 49mm Bands||49mm case size||/|
|Compatible with Azmax's 44mm/45mm Bands||/||44/45mm case size|