https://arstechnica.com/gadgets/2021/06/qualcomms-new-snapdragon-888-plus-soc-has-a-new-name-not-much-else/

Qualcomm has announced the mid-cycle update to the Snapdragon 888, the Snapdragon 888 Plus. As usual, this is the exact same chip as the previous version that hit the market in February, just with a faster clock rate. Those looking for a serious—or even noticeable—upgrade will be disappointed. This is the smallest "Plus" upgrade Qualcomm has ever done.

Qualcomm says the Prime CPU core—one of the chip's eight cores—can now hit 3.0 GHz, which is a five percent improvement over the 2.84 GHz of the base chip. After the Prime core (which handles things like foreground processing and main thread duties), the three "medium" and four "small" cores remain unchanged.