The Energia rocket was part of a family, apart from Buran and Polyus, no other versions flew. Energia-M was a cut down version, which got as far as a weight model – the colours and shape of my mesh are based on this.
But the original plan was to include a MUCH heavier rocket, the VULKAN.
This would have had eight of the boosters, and a second core stage that was basically an Energia-M.
I am working on this at the moment, though information is limited. The parachute packs on the boosters came after the Vulkan was cut down to become Energia, but I have done a version which includes these packs on the boosters. Seems VERY likely to me as the engines were designed to be reusable.
The boosters later underwent separate development, and evolved into the highly successful “Zenit”.