From the overall h2h, both teams have met 3 times and Milan was able to beat Inter 2 times and Inter was only able to draw 1 time. So I have an assumption that Milan has a higher spirit and ambition to qualify for the final round. Because Milan has no chance of winning the title in serie A and will certainly be more confident in the Coppa Italia.
The fact is that Inter Milan's first target is to secure the Serie A title. And the second target is to perform well in the Champions League. It is not certain whether Inter Milan will give their full effort for the Coppa Italia title. On the other hand, AC Milan is unlikely to win the Serie A title. The team will not even be able to reach the top four of the table. Now AC Milan will try their best to secure the Coppa Italia title.
AC Milan may be weaker than Inter Milan. Even then, AC Milan has played well in the last three matches against Inter Milan and has earned points. AC Milan defeated Inter Milan 3-2 in the Coppa Italia match last season as well. So even if AC Milan is not in a good rhythm, they have a chance of winning against Inter Milan. And the match is going to start in a while.