I can see some differences, but none of them seem "big".
In code you don't have all the extra communication avenues that we have when speaking, like body language, intonation, sarcasm and so on.
On the other hand, when writing code we are not speaking in real time. We can think about a problem for a while, consider the best possible way to solve a problem and how to explain it.
1) Coding clearing in the moment vs (2) coding clearly for future selves is two different mindsets/contexts right there.
(3) Communicating clearly is an orthogonal skill to coding clearly. I think this skill is barely acknowledged in engineering cultures in comparison to the above.
I feel you have to have an engineering culture that values institutional knowledge retention, team education and growth — and not treating engineers as fungible — to get to level (2). Level (3) would be a great place to work.
In code you don't have all the extra communication avenues that we have when speaking, like body language, intonation, sarcasm and so on.
On the other hand, when writing code we are not speaking in real time. We can think about a problem for a while, consider the best possible way to solve a problem and how to explain it.
What do you see as a big difference?