I’ve started attempting to work my way through Krito with the help of Steadman’s guide on pdf.
I also have the text in an old book.
Some of the words don’t match, specifically a difference of ξ vs σ. Where my book says ξυνηθης, Steadman’s version says συνηθης. As well, ξυμφορᾳ vs συμφορᾳ.
Ξ replacing Σ for ξυν/συν is a regular feature of the Ionic dialect (so Herodotus etc) and also in a number of other writers, namely Thucydides. Your guide probably normalized the spelling.