Google is expected to launch a cheaper version of its Pixel 4 smartphone this year - here's everything we know about it so far

The 91mobiles leak also suggests the Pixel 4a will have a rear-mounted fingerprint sensor, which may be one of the biggest differences between Google's rumored cheaper phone and the Pixel 4.

Google's latest flagship phone doesn't have a fingerprint sensor, but instead uses facial recognition powered by its Motion Sense technology to recognize when you're near the phone and begin the process of unlocking it. It's unclear whether or not the Pixel 4a would have Motion Sense based on the current leaks. But if Google does add a fingerprint sensor to the Pixel 4a, that could be a sign that it won't support Motion Sense.

Like the Pixel 3a, the Pixel 4a may also come with a headphone jack, according to 91mobiles and @OnLeaks. That would make it one of the few smartphones with a headphone jack, along with the Samsung Galaxy S10, Asus Zenfone 6, and a few other devices.

Another big discrepancy between the Pixel 4 and its cheaper counterpart could be in its camera. The Pixel 4a may only have one camera lens, according to the images posted by 91mobiles and @OnLeaks, while the Pixel 4 has two cameras: one standard lens and a zoom lens.

It's also likely that the Pixel 4a won't get all of the camera features that are available on the Pixel 4. But it will probably include some of the biggest ones, like Night Sight, which helps the Pixel take better photos in the dark.

Google unveiled the Pixel 3a last May, so if it sticks with the same launch cycle we can probably expect to see the Pixel 4a around the same time. The company typically waits until the fall to release its new flagship smartphones.