URF Balancing Each Champion Separately

Hi'll, Does Riot balance champions on their own for URF? I think it's important (Only cooldowns need to be balanced). Some champions' abilities are stronger, for example, abilities that use more mana. Mana and energy could also regenerate very quickly, instead of being always there. So powerful abilities are limited, just a little bit. Riot can test mana/energy regen in PBE.
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