Need help determining if used 87W USB-C power adapter is genuine

Hi,

I have a Macbook Pro 15'' 2018 model and recently bought a second, used

87W power adapter. It seems to function fine and feels like the real thing.

One difference is that the text printing on the adapter is of a lighter grey color

than the one that came with my Macbook (the text and logos themselves are identical).

I think that could be explained away by the used adapter being older.

However, what makes me scratch my head is the output of system profiler on the used adapter:

AC Charger Information:

Connected: Yes

ID: 0x1656

Wattage (W): 86

Serial Number: nil

Name: 85W USB-C Power Adapter

Manufacturer: Apple Inc.

Hardware Version: 1,0

Firmware Version: 1070057

Charging: Yes

The "Name" field reads "85W USB-C Power Adapter", but so such thing exists. For comparison,

this is the output for the adapter that came with the Macbook:

AC Charger Information:

Connected: Yes

ID: 0x1656

Wattage (W): 86

Serial Number: C0XXXXXXXXXXW85BB

Name: 87W USB-C Power Adapter

Manufacturer: Apple Inc.

Hardware Version: 1,0

Firmware Version: 1070069

Charging: Yes

I properly identifies as "87W USB-C Power Adapter" and reports a serial number (note: I censored the serial number above). That either means 1) the used power adapter is fake or 2) older versions incorrectly identify themselves.

Now I would like to know the system profiler output from other people having a 87W USB-C power adapter,

preferably from older versions, e.g, the 2016-2017 Macbook line.

Thanks for any help

Oliver