I've had both side by side. First off, the Heritage 75 is 30 watts. Creamback is 75 watts.
Heritage is brighter, but actually smoother on the top. The Creamback has some grit in the highs. The Heritage has a leaner low end that makes it tighter. In comparison, the Creamback has a really big low end.....like an Anniversary H30 on roids. There is a ton of high mids on the Heritage while the Creamback seems almost scooped in comparison.......but not as scooped as the Anniv H30.
I prefer the Creamback and they mix perfectly with V30's. I DO NOT like the 65watt small magnet Creamback.