I don't think he was as dirty as Zivic and certainly didn't hold as much as Angott (who did?), but there are parallels with Carmen Basillo in terms of a style that wasn't aesthetically pleasing, but nevertheless was effective.
I don't see particular similarities in their styles. Zivic has always reminded me of Hopkins, a polished, clever boxer w/ a sneaky right who can also mix it up inside. I think Angott's style is a bit akin to Fighting Harada, an unpredictable swarmer who ties up/smothers opponents inside.
I never said both are similar styles though @bolo specialist @Greg Price99 I just want to see more fighter with similar styles to both of them,hehe.