It's safe to say you'll be fine... expect possible potentiation and adjust your dose accordingly, take it slow until you get an idea of how they mix. I almost never take H without weed personally, though I definitely limit my H intake. There are no dangerous interactions between cannabis/concentrates and heroin though.
In fact the only dangerous interactions I've heard of with cannabis and opioids is precipitated seizures after smoking copious amounts of bud on high doses of tramadol, although it can be argued these people were on the verge of seizing up anyways.