I think this will be the case. This was also the case in the PSG match played in Paris, and Dortmund passed the elimination thanks to the posts. PSG had too many balls returning from the post. If something similar happens for Real Madrid, why shouldn't Dortmund beat them? Borussia Dortmund is strong enough to play at the top level. I'm sure Terzic will manage to adapt his students in the best possible way. Also, as a coach, I am sure that he will take charge of bigger teams in the coming years.
PSG and Madrid's attacking patterns are similar but they also have different characteristics.
Madrid to date have been more inclined to direct passes especially when there is Kroos on the pitch they will emphasize long balls that spoil their strikers. But if Madrid's midfielders are Camavinga, Modric or Valverde then it is certain that they will play a tactical game where the attack pattern will rely on the speed of the players.
This needs to be considered by Dortmund but the problem is that they also cannot do a defensive and attacking scheme because it will definitely be read by Madrid, which we know that they are one of the clubs that specializes in fast counterattacks embedded in their name so this method will not work for Madrid.
Dortmund also have some fast players but that I think is a little difficult because for now only strong determination can make Dortmund win from Madrid because seeing from the current situation the difference in the probability of Dortmund and Madrid is very large and Madrid is the favorite in this final match.