Robin Hood is one of the earliest examples of this. Cells from The Aristocats, Snow White and The Jungle Book in particular featured in this 1973 film. That’s because the production was running behind deadline.
One similarity is particularly striking, however. Because while Robin Hood borrows the odd cell from Snow White and The Aristocats, you might notice that Little John looks virtually identical to Baloo from The Jungle Book. In fact, the character was even voiced by the same actor, Phil Harris.