According to the source:
The Pixel 5 will come with 90Hz OLED screen, Snapdragon 765G, 8GB RAM, 12.2MP main rear camera, 8MP front facing camera, 4000mAh, plastic build and no headphone jack.
While the Pixel 4a 5G will come 60Hz OLED screen, 6GB RAM, 3800mAh and a headphone jack (other specs same as Pixel 5).
Google Pixel 4a 5G pictured next to Pixel 5 with specs
