The MR942 designator is most likely a partial Apple Manufacture Part Number, e.g.: MR942LL/A
From CDW, an Apple Authorized Reseller, in the image below see the yellow highlighted section.
According to Mactracker, a MacBook Pro with MR942 which they call it an Order Number, and which by the way is an incomplete Order Number, e.g. MR942LL/A, is a MacBook Pro (15-inch, 2018) 2.6 GHz Space Gray, as shown in the yellow highlighted section of the image below.
Mactracker is probably mistakenly calling an Apple Manufacture Part Number an Order Number.
Looking on the box my MacBook Pro came in, this convention corresponds to what's labeled as "(1P) Part No.", albeit a different sequence nonetheless, it matches the pattern of ?????LL/A and as such MR942 is in all likelihood a partial Apple Manufacture Part Number.