It doesn't matter if "x" rshares come from several voters or just 1 voter, these x rshares are added to the post, and the payout will be the same.
The difference is in the amount of rshares.
Currently (HF20):
The payout for 10^9 rshares is 1000 times the payout for 10^6 rshares.
The payout for 10^12 rshares is 1000 times the payout for 10^9 rshares.
The payout for 10^15 rshares is 1000 times the payout for 10^12 rshares.
The payout for 10^18 rshares is 1000 times the payout for 10^15 rshares.
The payout for 10^21 rshares is 1000 times the payout for 10^18 rshares.
However, with the new curve (HF21):
The payout for 10^9 rshares is 1000 times the payout for 10^6 rshares.
The payout for 10^12 rshares is 1111 times the payout for 10^9 rshares.
The payout for 10^15 rshares is 1793 times the payout for 10^12 rshares.
The payout for 10^18 rshares is 1004 times the payout for 10^15 rshares.
The payout for 10^21 rshares is 1000 times the payout for 10^18 rshares.