Here are my old ones next to the new ones.
First pair (not sure which side of car they are). The old arm's drain holes are further away from the wall of the cup. And the ARB mount is nearer the centre of the oval hole.
Second pair. Ditto re the drain holes and ARB mount.
Second pair with isolators locked in as far as they'll turn. Old arm's isolator is sitting flat on the floor of the cup. On the new arm it's not.
Second pair flipped over without moving isolator positions
Second pair enlargement showing position of locking lugs on isolators. The old arm's lugs still aren't at 6 o'clock but they're a bit closer than on the new arm.
NB. These pics are taken with a wide angle lens so there's bound to be optical some distortion. Also, I can't get the camera directly above the centre line without falling over - so the there's some slightly iffy perspective involved.