Yes.

A table scan (only present when you don't have a clustered index) is a scan of the data pages of the table.

An index scan reads the leaf pages of the index. If it's a nonclustered index, it'll be a lot fewer pages than the table.

A clustered index scan (only present if there's a clustered index) reads the leaf pages of the clustered index, which are the data pages of the table. It's virtually the same same as a table scan. There are some minor differences as to how SQL does the scan, but it is the entire table, like with a table scan.