Combine pork sausage and spicy pork sausage together in a bowl using your hands. Form mixture into meatballs, about 1 tablespoon each.
Fry meatballs in a skillet over medium heat until browned and completely cooked through, 15 to 20 minutes. An instant-read thermometer inserted into the center should read at least 160 degrees F (70 degrees C).
Transfer meatballs to a large bowl and add 1/2 of the orange juice concentrate; gently toss to coat, adding more if needed to completely coat.
Put meatballs in a slow cooker and add the remaining orange juice concentrate; turn on Low setting to keep warm before serving.