People overthinking this and making so many technical qualifier as to why OP is wrong. It’s just a comparison of two pairs of species that are only a handful of clades removed that share similar body plans. It’s not a correct or incorrect statement. Just OP’s observation.

Despite the age, this one also checks out.

People join Lambchop on the second line so presumably those kids are singing about themselves. Or they just didn’t take Lambchop serious and got stuck in the time loop singing to their doom before the regret even had a chance to set in.