When you’re looking for a replacement drive, its socket is for a B-keyed m.2 2242 (22m x 42m). I haven’t actually found any just-B-keyed on the market, so you’ll probably end up getting B+M keyed (like the stock drive).

Another guide which goes further into recovering the OS to the new drive is here: https://www.androidcentral.com/how-upgra...