According to the Google Play Developer Console device catalog, the Pixel 3a (Sargo) will likely be coming with a 2220×1080 pixels FHD+ 440 PPI display whereas the Pixel 3a XL (Bonito) will come with 2160 x 1080 pixels FHD+ 400 PPI display, i.e the Pixel 3a will sport a 5.6-inch display while the Pixel 3a XL will come with a 6 inch display and both are said to come with 4GB RAM.

Google Pixel 3a and Pixel 3a XL specifications (Expected)

The Google Pixel 3a will come with a 5.6-inch (2220×1080 pixels) FHD+ OLED display with 440PPI, while the Pixel 3a XL comes with a 6-inch (2160×1080 pixels) FHD+ OLED display with 400 PPI. The Pixel 3a is said to come powered by the Octa-Core Snapdragon 670 10nm Mobile Platform with Adreno 615 GPU while the Pixel 3a XL will come powered by the Octa-Core Snapdragon 710 10nm Mobile Platform with Adreno 616 GPU. 

Both phones are said to come with 4GB DDR4X RAM with 32GB / 64GB storage and will run on Android 9.0 Pie. It is said to come with a 12.2 Megapixel camera with dual LED flash and an 8 Megapixel wide-angle front-facing camera. The phones will come with a fingerprint sensor along with a 3,000mAh battery with fast charging.

Google has been testing Pixel 3a and Pixel 3a XL in India lately. .in might get these at very "low" prices (when compared to pricing in EU/US). 3a valued at 300 USD, 3a XL at 350 USD when imported for testing. No clue if this was based on estimated retail or value of shipment

— Roland Quandt (@rquandt) April 6, 2019

According to tipster Roland Quandt both the Pixel 3a and Pixel 3a XL will likely be priced very low in India compared to the EU/US, as 3a valued at 300 USD while 3a XL at 350 USD when imported for testing.