Is it possible to copy-and-paste content from previously published versions to current?

Is there any chance that I can copy and paste only specific components from previously published versions to current without reverting everything?

Unfortunately not at the moment, but as a workaround, you can do the following

Save/publish your current version so that you can restore it later

Restore your old version that you want to recover

Clone the project

Now restore your initial current version

Then you can follow the steps described here to copy and paste components from the old version. Deployments and automation | Learn Plasmic