20W USB-C Power Adapter compatibility

Although both of these are Type C plugs, they are two difference variations. They differ, not only in diameter, but also with their amperage rating.

Type C is the most widely used plug internationally. This two-wire plug is ungrounded, unpolarised and has two round prongs. It is popularly known as the Europlug which is described in CEE 7/16. The plug has two 4 mm round pins, measuring 19 mm in length on centres spaced 18.6 mm apart at the base and 17.5 mm apart at the tip. The two pins have 10 mm long insulated sleeves.

There is also a second, less frequently used version of the type C plug (CEE 7/17), which is rated at either 10 A or 16 A. Its pins have the same length (19 mm) as the 2.5 amp version, but they are not insulated and have a slightly larger diameter (4.8 mm instead of 4 mm).

Ref: https://www.worldstandards.eu/electricity/plugs-and-sockets/c/

I would judge the size difference are within the tolerances that wall plugs can handle

the female connector have like side clams or what one would call it to get the best connection so they expand