Is it possible to show one section for Desktop and other section for small screen in Html Email???

 Yes. It is possible.
If you want, It is possible to one section is only shows in Desktop but that section will hidded in small screen.
If you want, It is also possible that in Desktop version, one section is hidden in all email clients and it will shows smaill screen. It is a crictal technique in Responsive HTML Email. I have good knowledge on it.

If you are looking for this kinds of Responsive HTML Email Coding??

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