yes you can, in fact I was spec-ed by  a member or Phi Beta Sigma.  Keep in mind that things changes according to the campus you are in and the relationship between orgs. 
I have only spec-ed one member of Kappa Alpha Psi and my own org.  
Hope I aswered your questions 
		 
		
		
		
		
		
		
		
		
	
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