I have found that with flos and LEDs, this is especially true. You get into all kinds of issues like quality control, LED binning, overall color temperature quality that is not as much of an issue with tungsten or even HMI fixtures.
Take cheapo LED fixtures for example – poor quality control and LED binning leads to HUGE differences between fixtures. You read a review of a light that sings it’s praises, yet the one you receive is nowhere near as good. It’s very possible the one received by the reviewer was indeed good, but every fixture is different. The same thing applies to buying multiple fixtures. One looks great, one looks bad. Nothing you can do about it.
Kino has spent years upon years tweaking their products for exactly what we do – production. They work well repeatably and match well with each other and other types of lights. Lamps are a huge part of it also, the funny color from the off brand lamp can ruin a shot. Why should you have to start color correcting brand new lights? Not to mention the next batch may be totally different.
If your main camera guy has a Diva, you should definitely buy something from that same family.