The existing OctaPlus design is not backwards compatible with the new TECH Multi Bracket.
By design, the OctaPlus lightbanks were designed with bare bulb fixtures in mind, and feature a shape to complement that.
The new OctaTECH lightbanks are designed to produce the same even, wrapping light of an OctaPlus, when used with panel LEDs, which output a significantly different quality of light compared to bare bulb lights.