Can one eat pareve food baked in dairy utensils (tray) together with pareve food baked in meat utensils?
Yes, there is no problem in this.
Pareve food baked in dairy utensils remains pareve.
Although according to Ashkenaz custom (Yoreh De’ah 95:2) if the utensils were ben-yomo it is not permitted (on a lechatchilah level) to eat the food with actual meat. However, there is no problem with eating it with pareve food baked in meat utensils.