@ASHISHIBM One can sync the assets from one AEM instance to another AEM instances using Connected Assets( CA ) or Sling Content Distribution(SCD) methods. The sync has to be manually trigger by means of publishing from source or you need to enable a jcr trigger on upload of an asset to sync to another DAM through SCD.
Enabling SCD Forward distribution is pretty straight forward though it has lot of configs, please check the below blog.
https://www.bounteous.com/insights/2022/09/15/adobe-experience-manager-distribution-based-publicatio...
Those two methods( CA & SCD ) are OOTB features which just needs to be configured as per requirements.
Hope this helps!