Is Osmo Pocket 4's 1-inch sensor the same as Osmo Pocket 3?

No. Osmo Pocket 4 features an all-new 1-inch stacked CMOS sensor, which supports up to 4K/240fps uncropped recording (available only in Slow Motion mode) and full-pixel PDAF, delivering enhanced overall performance.

Related Questions

Is Osmo Pocket 4 waterproof?
No.
Can Osmo Pocket 4 be connected to Bluetooth or Wi-Fi?
Yes.
Can I change the lens of Osmo Pocket 4?
No.