U have to think about it in terms of percentages rather than raw numbers though
After Sanji's first bounty it was 77M - 120M, so Sanji's bounty was around 64% of Zoro's
Then it was 177M - 320M which is almost a 150M gap but it's still a similar percent difference (55%)
If they get a 100M gap this time, but let's say it's 1.5B - 1.6B, Sanji's bounty would be more than 90% of Zoro's bounty
After Sanji's first bounty it was 77M - 120M, so Sanji's bounty was around 64% of Zoro's
Then it was 177M - 320M which is almost a 150M gap but it's still a similar percent difference (55%)
If they get a 100M gap this time, but let's say it's 1.5B - 1.6B, Sanji's bounty would be more than 90% of Zoro's bounty
rewatching kingdom 
