Is it possible

That is possible, there are actually dozens of ways to do this.

For example... structure blocks can only control an area up to 32x32x32. But... those structures can easily include other structure blocks that are tasked to load the next part of the structure. If you use dynamic coordinates then it'll simply "add" onto the main structure. Did you know that observers get activated if they're part of such a structure? Could be the ideal way to trigger a structure block to load the next part.

Of course the intended way of handing this would be jigsaw blocks. But that can get a bit tricky to set up. Still... if you need an example then just check the /place command (I'm playing on 1.20.1, so this applies to 1.20 and up). If you add something like a mansion or the trail ruins then you'll end up with a pretty big building. Shouldn't be too hard to use that as an example to set up something of your own.

What version are you playing? [​The answer (particularly as to the specifics) varies.]


For java, MCA Selector allows 'writing' an entire world over another so 16x16 chunks would be simple.
NOTE: if the world versions differ this can cause issues, particularly between versions where the vertical world limits changed. It also writes the chunks as they are, the biome of the chunk and the presence of some structures is not included. [​Doing something like 1.12.2 to 1.13, however, caused no issues other than some discontinuities at the borders.]