India, Sept. 11 -- Apple Watch Series 12 looks remarkably familiar, but the important changes are buried beneath the display. Compared with Series 11, Apple has concentrated on processing power, health sensing, charging speed, and durability rather than redesigning the watch.

For Series 11 owners, that makes this a selective upgrade. The biggest technical gains are the S11 chip, a new sensor system, faster short-duration charging, and a reported doubling of RAM.

Series 12 replaces the S10 processor with Apple's newer S11 chip. The available information does not include CPU clocks, GPU specifications, manufacturing process details, or benchmark results, so it is too early to quantify the raw performance difference.

The practical change ...