if they are separate blocks

Is this a question, or...? Do you mean, if it is a separate block? Yes, it is a separate block.

Are you talking about a custom block type based on the default 'content' block type? If so, I think that would be possible by editing editor_config.php. But if you're talking about just different blocks with the default 'content' block type, I have no idea how to do it.

if you need a simple text area, just use jordanlev's designer content block. it allows you to create blocks in a very intuitive way. definitely worth checking out.

if you need tinymce interface except for a few functionalities.... just go to editor_config.php

yes, that would change all of the content blocks. haven't tried this yet, but try making a folder into a templates folder inside the content block folder and copying editor_config into it. then go to custom template and choose the name of the folder you just created to select that template. I believe that should override every file with the same name. obviously it does that for at least view.php and view.css

try it and let me know how it went.