Vertex Illumina help

[Sixpack]

Hi
Does anyone know if I am able to swap head unit controller from one Illumina to another without damaging the light?
The reason is that I have 2 Illumina and one unit doesn’t hold time and date memory even though I replaced the back up battery, while the other one works fine. One of the unit is for back up in case of failure but I just want to make sure it’s ok to swap controllers when the time is needed with no issues.
Thanks