As of 2017, when I bought my TRD Off Road.
And, presuming you mean "TRD Off Road Premium" rather than "TRD Pro". (Is that correct?)
Prior to 2017, the Premium came with a moonroof/sunroof thing. Not so in 2017.
Premium came only with black fake leather seats. There were many comments from people living in the Southwest parts of the US who said those seats got extremely hot in the sun. Indeed, a friend bought a Prius with those seats and although he was wearing a pair of thin hiking pants, got a "1rst degree" burn on his legs, which is basically like a sunburn. The regular TRD Off Road comes with fabric seats.
The Premium came with "puddle lights". I think it would be cool to have but.
The Premium also came with turn indicator lights on the mirrors, definitely a good feature IMHO.
I believe the Premium also had front driver and passenger power seats. The regular TRD Off Road had only front driver's side power seat.
That is the extent of it to my knowledge.
I chose the regular TRD Off Road because I did not want the fake leather seats. I sacrificed the other features. I thought I was losing the sunroof but in 2017 it wasn't standard on the Premium anyway.
I hope that helps. I don't know what might have changed in the last four years.
The TRD Pro, that is an entirely different animal, but I do not think you were asking about that. (??)
The people at the dealership knew exactly zip about any of this stuff. Plus, the "build your own" thing on the Toyota site, it is bogus. The vehicles aren't that easy to get and good luck, much less getting a custom configuration. Far as I could see, that was just a sham which tries to match up what you want with a model that is available, which might be if you ordered it in a common configuration. Well, as of 2017 anyway.
Alright then ?