I think that's probably the case for anchors Pepper. Unlike the other fittings that boats use (cleats, winches, bollards, etc) there are few different designs for anchors. Sailors are VERY particular about the anchors they use because their life may depend on how well it holds during a storm, and as a result, there's been a lot of testing over the centuries and only a very few designs were found acceptable.
Anchors are one of the few things on a boat/ship that I expect to seem almost the same on each one.
Almost all naval boats and ships use what's called a 'navy stockless anchor' which is very heavy but stows well without taking up much room. If you look, you;ll see the U-boat anchors are almost the same as the battleship anchors, just smaller. And the anchors on a British or American or even Japanese vessel should be nearly identical.
BTW, id you want to make your U-boat anchor more realistic, cut the shaft off and either make a new shaft yourself out of brass or plastic, or try to save what you can of the original. Hollow out the space in the base between the flukes so that the end of the shaft can fit into AND pivot back and forth, front to back.
Take a small brass wire, the size that you have a drill bit for, and drill sideways in the base from one fluke to the other, making sure that the drill passes through the hollow that you made in the base. If necessary, expand the hollow so that the drill passes through it with enough room to s so that there's a space all around the drill bit.
Then drill a hole through the end of the shaft so that the brass wire can fit through the base AND the end of the shaft when it's in the hollow.
Assemble the three parts together and now you have a navy stockless anchor that actually moves like the real one.