The two phones look fairly similar, with each sporting a flat display with slim bezels and a hole-punch selfie camera. Around back, both phones have an updated camera bump design that wraps around to the sides of the device, and there are three rear cameras on each model, too.
Two differences between the two phones that confirmed by today's leak include the size difference between the two models. A previous rumor said that the S21 has a 6.2-inch display while the S21+ (shown below) is packing a 6.7-inch screen. It's also said that the Galaxy S21 will have a plastic back while the Galaxy S21+ and the S21 Ultra will have glass on their backsides.
Both phones are also expected to include a Snapdragon 888 processor in the U.S. and an Exynos 2100 chip in other parts of the world. They're both said to have 120Hz refresh rate support and faster in-display fingerprint readers, too. The rear cameras on both the S21 and S21+ are said to include 12MP main, 12MP ultra wide, and 64MP telephoto cams, and the S21 will reportedly have a 4000mAh battery while the S21+ will get a 4800mAh battery.
Several reports have said that Samsung will announce the Galaxy S21 series on January 14. A release will purportedly happen a couple weeks later on January 29.