re: "...could I more or less do a direct swap of everything into my car, without replacing the turn-signal assemblies or messing with the fenders?..."

No. I wish it was that easy, honestly.

The parking lights are attached to, and supported by, the headlight housings, so you'll have to fabricate some brackets.
Also, the grille on the newer model protrudes farther forward, and its upper fasteners are farther back -- you'll have to fabricate some brackets for these, too.

And you'll need something to cover or surround the headlights. You might be able to fit the original style surrounds -- if you want a fiberglass set* from the truck version, contact me and I'll sell a set to you, cheap.
[keep in mind that you will still have to fabricate a way to fasten the surrounds (either type) to the car's foward bulkheads.]

Good luck. Some folks have done a really nice job of this -- and others haven't.