Only if they vote within 24h and large stake votes after 24h.
It also depends on how much stake votes after or how much rewards a post had in the first 24h.
For instance, if you vote a post from 0 to 0.10$ and then a whale comes and votes it after 36h to $10, you're only going to get like 10-20% increase on your 0.10$ vote, but if he votes it after 48h you get a higher %. I believe each day's window increases your return but to a certain limit like 300% max or so. So for the whale it may not matter much if he gets a post from 0.10 to $10 on day 5-6, but if the voter in the first 24h was also a whale then the 2nd whale is going to lose out a lot more returns which is the case of my post above.
I see. this is more complex than I imagined.