Because sections are specific to projects and are not shared between projects, you can’t accomplish this directly.

So what you can do is use a custom field (you can also use a tag) to in essence link the two projects together, and then create rules in each project.

For example...

Step 1:
In Project A you create a rule like If task gets moved to Section ‘In Progress’, set the value of custom field ‘Status’ to ‘In Progress’.

Step 2:
In Project B, you create a rule like If value of custom field ‘Status’ gets changed to ‘In Progress’, move the task to the ‘In Progress’ section.

Note that you have to make sure the custom field is a global one; that is, it lives in your organizational custom field library.