Great question! Generally yes you can, BUT some communities do not invite "cross-posts". This is 1 reason its very important to read every community's rules before posting there. Most rules just involve plagiarism and abuse but some communities specifically dont want cross-posting.
With that said, if you don't see anything in the rules about it you're probably good, just be sure the content is directly relevant
!PIZZA
RE: StarterKitDAO Posting Guide Pt 2 - HIVE Post Walkthrough