Casting Reap What Is Sown on the Heroes will each trigger their heroic ability independently, which means each payment of X will be independent of the other one's payment for X. Thus, paying mana to put +1/+1 counters on a Hero will put the counters only on that one specific Hero, not any other Heroes.
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How to use card tags (please use them for everybody's sanity)
[c]Lightning Bolt[/c] -> Lightning Bolt
[c=Lightning Bolt]Apple Pie[/c] -> Apple Pie
Vowels-Only Format Minimum deck size: 60 Maximum number of identical cards: 4 Ban list: Cards whose English names begin with a consonant, Unglued and Unhinged cards, cards involving ante, Ancestral Recall
Whenever a card refers to itself by name, it just means "this card". It doesn't mean "all cards named that" -- the templating for those effects will actually say "cards named..." (or "creatures named..." or whatever).
So a payment for one Hero of Leina Tower only puts counters on that Hero of Leina Tower, not on any other creatures named "Hero of Leina Tower".
Reap What Is Sown
Casting Reap What Is Sown on the Heroes will each trigger their heroic ability independently, which means each payment of X will be independent of the other one's payment for X. Thus, paying mana to put +1/+1 counters on a Hero will put the counters only on that one specific Hero, not any other Heroes.
[c]Lightning Bolt[/c] -> Lightning Bolt
[c=Lightning Bolt]Apple Pie[/c] -> Apple Pie
Vowels-Only Format
Minimum deck size: 60
Maximum number of identical cards: 4
Ban list: Cards whose English names begin with a consonant, Unglued and Unhinged cards, cards involving ante, Ancestral Recall
So a payment for one Hero of Leina Tower only puts counters on that Hero of Leina Tower, not on any other creatures named "Hero of Leina Tower".
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Lightning Bolts don't kill creatures. State-based actions kill creatures.