https://www.cnet.com/news/samsung-reveals-new-galaxy-a-phones-at-mwc/

The differences start with the cameras -- the A50 offers an 25-megapixel shooter on the front, with 25-, 5- and 8-megapixel options on the back. The A30 has a 16-megapixel one on the front, and 16- and 5-megapixel cameras at the rear.

The A30 has 16- and 5-megapixel cameras on the back.