Would a 44 foot shrimper be a trawler? My father made one out of a hull he bought out of a farmer’s field, after Hurricane Carla.
Generally bottom draggers need enough displacement to lift heavy loads they didn't plan on catching, or be able to break their gear free using only one trawl cable, on one side, or at least be able load net and doors all one side of the boat when it's tangled. Or eventually capsize. I know of some small ones trying to do a bigger job that are now on the bottom.
Just the difference between '44 and '38 can be much more considerable than the length alone would have one believe. Then there's different measurement protocols, one at the waterline overall, some from rudder post to waterline at sheer at waterline, then Panama measurement overall EVERYTHING including the anchor hanging over the bow on the typical Gulf Shrimper (many of which made their way to the West Coast and I spent quite literally years at sea onboard).
Does that answer your question?