Yup, it was just I realizing the difference just now. Guess I haven't paid enough attention to the pillar-pictures for me noticing only now...heck, was I blind? Even his shoulder-armour is missing in his younger incarnation.
As for the new art, the only difference I can see in Ven's is that his arms are placed differently, he leans more towards the viewer and has a slightly different facial expression.
For Terra's, he has now Earthshaker instead of Ends of the Earth, his hair is more detailed and the colour contrasts are made better.