Ansible Perform Tasks in localhost on Multiple Hosts - ansible

Question

I'm planning an Ansible playbook which will query version number of specific .exe file on windows hosts, then generate diff version between the version installed on the Windows hosts and the latest version stored on the Ansible controller Linux machine ("localhost"), and deploy the diff version to the Windows hosts.
My playbook looks something like:
- hosts: winClients
gather_facts: False
tasks:
- name: check exe file version
win_file_version:
path: C:\my.exe
register: exe_file_version
- name: Set client version
set_fact:
winClientExeVersion: "{{ exe_file_version.win_file_version.file_version }}"
Then, on localhost, I have folder for each version, and I'd like to generate the diff between the latest version and the version on the winClients. The versions are stored on localhost in folders named with the version numbers, e.g. MyVersions/1.0.0.0/abc.exe, abc.dll, aaa.txt, ... and MyVersions/1.0.0.1/abc.exe, abc.dll, aaa.txt, ... etc. And I have special folder, MyVersions/LatestVersion/ that always contains the latest version. So I need something like:
- hosts: localhost
gather_facts: False
tasks:
- name: check latest version on server using PEV
shell: peres -v /home/user/MyVersions/LatestVersion/My.exe | awk '{print $3}'
register: latest_file_version
- name: Set server version
set_fact:
serverLatestVersion: "{{ latest_file_version.stdout }}"
- name: If versions differ, generate diff between client and latest versions to temp DiffFolder, then delete empty folders
shell: rsync -rvcm --compare-dest=../{{hostvars.winClients.winClientExeVersion}} . ../DiffFolder && find ../DiffFolder -depth -type d -empty -delete
args:
chdir: /home/user/MyVersions/LatestVersion
when: serverLatestVersion != hostvars.winClients.winClientExeVersion
Then I copy the generated diff to the Windows clients using win_copy.
Now, all this works OK when winClients represents only one specific client.
My problem is, how to do it for group of clients, i.e. in case when winClients represents a group instead of one specific computer? How can I generate diff for each client separately (and each client might have different version installed on it), based on its previously-retrieved version number, when its version number differs from the latest version on server?
The winClients upper section will assign version number for each of the clients, the problem is with the localhost tasks and their when condition.

Answer 1

So it turns out to be pretty simple: with_items does the trick, and it can be referred later in when as well.
Example:
- hosts: localhost
gather_facts: False
tasks:
- name: Notify if versions differ
debug:
msg: "client and server versions differ: Server: {{ serverLatestVersion}}, Client: {{ hostvars[item]['winClientExeVersion'] }}"
with_items: "{{ groups['clients'] }}"
when: serverLatestVersion != hostvars[item]['winClientExeVersion']
This will loop through the clients in clients group, and for each client that got a different version than the server, notify in debug.
Similar method can be used for each task (copy, rsync, etc.) that requires to be executed only against relevant client, based on when condition.