First off, its practically the national dish of Canada, the boxed Kraft version ("Kraft Dinner") is the is the most popular grocery item in Canada - https://en.wikipedia.org/wiki/Kraft_Dinner
Germans have pretty much the exact same thing in Kasespatzle (spätzle with cheese).
Depending how you want to define "mac and cheese," the original Italian preparation of fettuccine alfredo is pretty damn close, the only ingredients are pasta, butter, and cheese.
We always pick up a case of 16 when it drops below $10.
These days there is much more variety, and judging from the popularity of the many varieties of pasta and cheeses such as Pecorino and Parmesan in the supermarkets, many Dutch household have discovered the joys of cooking proper Italian pasta dishes. Plenty of folk here do use store-bought packages for the sauce of course, but these tend to focus on adding flavour to the meat and vegetables (tomato) that serve as the bulk of the sauce (like bolognese).
Frankly, the classic US mac-and-cheese dish looks disgusting. I can only imagine how it must look to someone with an Italian heritage.
The 'Margriet' cookbook (to just take one example that represents mainstream Dutch cooking) has had a recipe since the first edition.
Recipe: Cook macaroni, or other short pasta
Meanwhile...
Melt butter
Stir in flour to get soft paste
Stir in milk and grated cheese
Stir until sauce cooked
Combine pasta and cheese sauce
Grill or oven bake for five to ten minutes
Substitute cauliflower for the macaroni, sprinkle breadcrumbs on top, and you get the classic British disk 'caulifower cheese'. A whole nother comfort food.
Sidenote: The mac and cheese here all boasts how it is an American food. The box (that is like Kraft) has flags and stuff on it. Of course, they'll also sell an "American" ketchup next to a couple shelves of Heinz.
When I was 10 and overseas and could only find 'American ketchup' aka spilva (think red tomato sauce and sugar), I and my family by happenstance bought three bottles of Heinz ketchup from a Chili's Picca in downtown Riga, after stopping there to eat dinner in defeat, having shopped for real ketchup all day and come up empty.
I suspect by now that there are several grocery stores in Riga with Heinz brand ketchup, but at the time, there were none that we could find.
One thing I seem to observe in the US is macaroni cheese being used as a side-dish, and I think in many cases in the UK that would be replaced with cauliflower cheese, which seems like a complete waste of a good cheese sauce to me, but each to their own.
https://www.thedailymeal.com/travel/14-ways-people-make-mac-...
As much as I enjoy eating and cooking US Mac and cheese, I love me some Käsespäzle. Oh so good. After we are allowed to travel again, I’m off the Germany for more.
While you're there, as I'm guessing you ate this in the South, have some extra cheesy Flammkuchen with a nice local Riesling. German cuisine is super utilitarian for the most part, with very little variation from the meat and 2 veg routines but Baden-Wuttenberg's amazing Agriculture and Vineyards make it stand out.
Plus, I don't think they are allowed to call it "cheese" in Canada?
You can find it in the "American" part of the international foods section of big grocery stores here, along with pancake mix, root beer and Skittles :P
Edit: also long vs. short noodles. There's really no commonalities between the two besides the inclusion of noodles and cheese, which applies to probably hundreds of dishes.