Bike geometry was pretty well understood by 1950, at least for 700c wheels. It gradually and subtly changed as tires got narrower and roads got better. By 1985 or so it had arrived pretty much where it stands today. You'll see small variations among manufacturers (and among bikes made for different purposes) but they generally count for almost nothing. Speaking very generally, 73 degree angles for both seat and head tubes are pretty much standard for 700c bikes. That can vary by a degree or so in either direction, and most people won't be able to tell the difference.

Fork rake has also become standardized at around 43mm. Again, it varies somewhat by manufacturer and purpose, but with notable exceptions (French randoneuring bikes for example) it won't vary much, and small variations are almost undetectable by most riders.

Some people include things like chainstay length under the heading of "geometry" even though it really isn't. And again, chainstay length doesn't tend to vary much, at least within a given category of frame. And again, length variations of a couple of centimeters are almost unnoticeable by most riders.

Now, this is all opinion, but it is opinion arrived at after several decades of riding and racing and about eight years of designing and building frames. There are folks who will disagree with those opinions - sometimes angrily - and folks who claim to be able to detect microscopic differences (and believe that such differences amount to a very big deal). Ask your question on the road forum and you'll see what I mean.

The short answer, FWIW, is that frame geometry is the angle of the seat and head tubes along with the amount of rake in the fork, no, it generally doesn't change much, and the year-to-year changes we do see are almost always done for marketing purposes.

HTH!

<edit> In comparing the two frames, I note that in the larger sizes the 7.4 has a slightly steeper head angle and slightly less fork rake. To a sensitive rider this will make the frame slightly less stable and slightly more responsive to rider inputs. A less sensitive rider is unlikely to notice any significant change. Also, the 7.4 (again in the larger models) has a slightly more relaxed seat angle. This is not going to change the handling, but will allow the rider to move his seat back a little more, if he/she wants.

IMO the changes make sense; the 7.3 geometry was a little weird. Real world, though, it's just not going to make a significant difference.