The two phones are different in size, with the iPhone X being the first bang-screen phone released in 2017 with a 5.8-inch screen, followed by the iPhone XR, iPhone 11 and iPhone 12 with a 6.1-inch screen.
The iPhone X has a 5.8-inch screen
iPhone 12 has a 6.1-inch screen. I think the size of the iPhone 12 is relatively appropriate, and the size of the iPhone X is slightly smaller to use, such as watching TV, which still feels a little small.
The iPhone 12 is not the same size as the iPhone x. The iPhone 12 has a 6.1-inch screen and the iPhone x has a 5.8-inch screen, so the iPhone 12 is bigger than the iPhone x.
The iPhone 12 and iPhone x have different screen sizes.
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iPhone X uses a super retina HD display, 5.8-inch OLED material full screen, with HDR display, 2436*1125 pixels resolution, 458ppi, with P3 wide color gamut display and 625cd\/㎡ maximum standard brightness;