Yes you can. I do not know WordPress, but this seems like just a permissions issue anyway. You can do one of several things. First, if the user www-data can FTP then that would be expedient, but perhaps not as safe as you want it to be since www-data should not have FTP permissions for security reasons. Alternatively, your user revxx14 could be modified to join the group that www-data belongs to and the file permissions modified to allow group modifications. This would allow you to drop the files into place, but you may still need to change file permissions.
However, the best solution is what I do. I create a temporary directory within the users home directory (in this case revxx14). I FTP the files there. Then I SSH in and copy the files from the temporary directory to the website with appropriate permissions. You would use cp to copy the files from your temporary directory to the destination, chown to change the destination file ownership, chgrp to change the destination file group ownership, and lastly chmod to change the permissions of the destination files. Lastly, use ls to check that you did your work correctly. Take note of the file ownership, group ownership, and permissions before you begin.
If you are not familiar with this process, create a situation where you practice using these commands where it would not matter if you make a mistake. Perhaps from one user to another user temporary directories. You may need to use mk to make the temporary directories.
Keep in mind that the files withing the web space are set specifically for security reasons and that should not change. If you copy these files from your temporary directory to the web space, then the files would have revxx14 users ownership, group ownership, and default permission. This means that for each file you copy, you would need to set the ownership, group ownership, and default file permissions to match the original file or other similar files. For example, some may have execute permissions while others only have read or read/write.
For myself, I know my files ownership and permissions natively so I can do mass file ownership and permissions changes using wild cards. I would only recommend using wild cards when you are sure of what you are doing. If you feel comfortable with the commands above, then you can use wildcards too.