Import flow without duplicate

Sorry, but I don't understand .....
On my pc I export a flow (modified) generating one file ....
Now I I would like to import this flow but in my raspberry there is the old flow that I modified on my pc.

I select import, I select the file (of course) and I have this form ....

one

I select View nodes and I have this form ....

two

and I read:

Some of the nodes you are importing already exist in your workspace.
Select which nodes to import and whether to replace the existing nodes, or to import a copy of them.

Well, I would like to overwrite the existing nodes with the new nodes modified without have duplicates like in the next image ...

three

How can I do?

What version of Node-RED are you using?

The "import nodes" dialog should have an extra set of check boxes to say if you want to overwrite a node or not.

7 May 11:26:42 - [info] Node-RED version: v2.1.6
7 May 11:26:42 - [info] Node.js version: v14.16.0
7 May 11:26:42 - [info] Linux 5.4.0-109-generic x64 LE
7 May 11:26:43 - [info] Loading palette nodes
7 May 11:26:43 - [info] Dashboard version 3.1.6 started at /ui

Take a look at the 'projects' option. Using this when you want to import the new version you could create a new project (and give it a version number in the title) and import the flow. Since it is a new project it will be empty.

This way if you need to go back to a previous version you can do by selecting the older version of the project.

Very interesting, thank you ....