Two pics attached, one showing the 2UZ ports and the other the 1UZ intake on the 2UZ.
Notice how the ports are almost vertical, maybe 15% from vertical. The mating flange is perfectly horizontal. It's just a straight shot right on the valves. I believe the early 1UZ heads have a more curved port with an entry angle more like 30% from vertical.
As far as I can tell , the 2UZ heads are nearly identical with the 1998+ 1UZ heads. The only difference I have found so far is that the extra cam seneors are not there for vvti, altough there is plenty of aluminum there to drill and htread for them.