No, they are different structures, although both are made on machines with two needle beds. Rib has visible vertical ridges and high stretch across the width. Interlock is made of two 1x1 ribs knitted into each other, so it has a smooth face on both sides, no visible ribs and less stretch, with a more stable and fuller feel.
They are confused because interlock looks like a stretched rib. Pull a rib and you see the ridges, pull interlock and you do not. Rib suits pieces that must hug the body, interlock suits pieces that must keep their shape.
ribinterlockcomparison
