I'm only a TL, so I cannot guarantee what I say is 100% accurate, maybe a C and/or TC could confirm...
I'm pretty sure the hole size remains the same for all tiers, simply because it's a photograph. I don't believe WGT resize the hole within their software for different tiers. As far as I know, course conditions, green speed, tees, and anything else, is the same for all tiers from Tour Legend upwards. In fact, the only difference between Legend and the higher tiers is the green speed; I think Legend greens are speed Tournament 12.
I think I'm right in saying that Championship 14 green speed is reserved for major tournaments (maybe even just the final stage of a major tournament), and the weekly 9-hole Nation tournament for TL's and upwards.
Why then, you may ask, do we have Champion and Tour Champion tiers if everything is the same as Tour Legend? It's simply for the exact same reason the Tour Legend tier was introduced - because there were too many players at Legend tier and so the tiers became unbalanced. As more players move into the Tour Champion tier I'm sure WGT will once again need to create one or two more new tiers to thin out the TC tier.