Can't say one way or the other if I've noticed any changes, but it is definitely a "different" course.
Merion may, arguably, be the most challenging course on WGT. Forget the 325yd plus driving, the strategy and precision required to be successful is elevated to a very high level. Considering this, in real life many of today's players could probably play without a driver.
I live 10 miles from Merion. I is quite unique in size and location. Nestled in Ardmore, Pa, it is only 126 acres. The next time you play a round, take a look at some of the beautiful Ardmore homes that surround it. Also notice how close it is to boarders. Ardmore Ave runs parallel to, and only a few yards away from the Par 5 2nd Hole. At a latter dogleg hole, a drive of about 260yds will leave the course and land in the street..
An excerpt from Wkipedia layout covers only 126 acres (0.51 km2) of land, a very small area for a golf course. It was ranked 5th in Golf Digest's "America's 100 Greatest Golf Courses" in 2015, and Jack Nicklaus has said of Merion East, "Acre for acre, it may be the best test of golf in the world."
Check out the full Wikipedia article for an interesting and informative history from the 1740 farm, and farmhouse which is now Merion's Club House, to the 1896 Merion Cricket/Golf Club, the design and addition of the East Course in 1912, the tournaments, players, and highlights, to the present day.