The offset keys are designed to compensate for wear on the gears and stretch of the chain. Since you are using all new items there is no need.
The way you would know need, would be to do the measurements. The only special tool needed is a dial indicator to measure valve lift as all Cam indexing is done relative to a certain amount of cam lift. The balancer has the degree wheel.
Bosch Master, ASE Master, L1
33 years MB technician