What are differents between fillParentMaxWidth() and fillMaxWidth() in Compose?

The following Code A is from the official sample project.

It seems that I get the same UI result after I replace the two fillParentMaxWidth() with fillMaxWidth().

What are differents between fillParentMaxWidth() and fillMaxWidth() in Compose?

Code A

@Composable
private fun ExploreList(
    exploreList: List<ExploreModel>,
    onItemClicked: OnExploreItemClicked,
    modifier: Modifier = Modifier,
    listState: LazyListState = rememberLazyListState(),
) {
    LazyColumn(modifier = modifier, state = listState) {
        items(exploreList) { exploreItem ->
            Column(Modifier.fillParentMaxWidth()) {
                ExploreItem(
                    modifier = Modifier.fillParentMaxWidth(),
                    item = exploreItem,
                    onItemClicked = onItemClicked
                )
                Divider(color = crane_divider_color)
            }
        }
        item {
            Spacer(modifier = Modifier.navigationBarsHeight())
        }
    }
}