Yes, definitely because each one brings a unique flavor and texture to the final recipe. If you only used whipped cream which a lot of no-bake recipes do, it is far too light and boring in my opinion. Mascarpone cheese is essentially an Italian cream cheese but with a higher fat content than the cream cheese we use in the U.S. to top our bagels. That's why most Italian desserts are ridiculously good and by adding the cream cheese and mascarpone cheese it makes the cream more stable. This is why if you order tiramisu at a restaurant it comes as a neat square and not a goopy, runny mess on your plate. Top the lemon tiramisu cake with any kind of crushed lemon cookie, there are lots of varieties to choose from but try and get one with a good lemon flavor. I managed to find a box of lemon and white chocolate biscotti which were perfect for sprinkling on top. Garnish with the cookies right before you serve it though so the cookie crumbs don't become soggy in the fridge overnight!