Why do you think people switch from MH to HPS usually when moving to flower? Lol why use two different bulbs if they work the same? Same issue here just different light source.
If you ONLY do that, then yes. 4000+k lights have more blue great for veg.
The point he was making is that 3500 can do both tents as needed, say you switch things up or upgrade in future and wanna swap lights around, you could.
From all the researching about spectrums ive been doing, 4k looks pretty crappy with too much green in the spectrum (which the plant doesnt use), if they have a 5k or higher thatd be better blues
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