Question About BaseCamp Routes

I like 3.2.0.10 beta routing windows being able to select for 6 different routing options in the window for the route in question is great. Most of my routes involve 2 waypoints a start and end. I realize If I add waypoints along the way will help and I have an appreciation for the complexity of the problem of uploading routes or waypoints to a GPS and have the GPS get the same route. I currently have a 1490LMT and I don't believe I can match the routing options I have in base camp with the 1490. If I have a truck route I like in BaseCamp and just add the ending waypoints to favorites I am pretty sure the 1490 won't calculate the same route. If I upload the route to the 1490 will the chances of getting the same route be better?

Thanks