Hi…is true that the left heroes charge mana faster than the right heroes
Nope. On offense, each individual hero charges based on the mana speed of that hero (can be boosted with mana troops or family bonuses). In defense position, usually players keep the slower heroes in the middle so that they charge faster when hit with tiles. And for heroes which give mana generation, like Alberich or Misandra, players usually keep them in the left, so that after they fire their special another hero might use their special too. Hope this helps 
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