No, not all buffs are made equal. Kizaru already being so viable in battle, I'm gonna assume Kuzan's awakening will raise his level much higher than Kizaru's awakening would raise his lvl.
And it makes sense too, if Kuzan's temperatures started actually affecting top tiers from a range, his awakening would make him ridiculous. Rn the issue is attacks like flash freeze, ice ball, and even partisans are coming off as useless against top tiers. Ice glove is cool, but yea it doesn't have any shot against Kizaru. If these kinds of attacks start working on top tiers like they do against high tiers....yea Kuzan is arguably more busted than Kizaru....and this is something his awakening can potentially do for him. Kuzan is the AOE king.