Usually, yes. Sound creators typically provide minimal revisions for free and will be happy to do more detailed revisions. You get up to 2 revisions free. Each additional revision will be $50 per each revision.
Your best bet is to ask the sound creators directly if they can make your changes, or during the Sound Handover stage.
Note that sound creators aren’t obligated to make any changes to their winning sounds, so if you want to ensure your changes will be made, ask for them before you authorize the release of funds.