Brief speaking, yes, you can use the same machines for processing pineapple , mango, similar as you can use your same kitchen, or pans for different dishes.
To be specific, from pineapple, mango to juice, you need to consider the several steps, wash, remove peel skin&core(which are not edible), then extact juice from flesh, go to filling, sterilize, packing.
For washing, you can use same machines. but for peeling machines, which pineapple use? and which types mango you use? do they have similar size, , one peeling machine can peel pineapple and mango?Because the size and shape of them are big difference. and more, what capacity you want to process, if just several liters, you can peel by hands, extract juice by juicer. It would only takes you several hours. By when it comes to industrial use, what if you need to process 1–10tons pineapple per day? what’s the foremost question for you is not the same machine can process both? It should to how to finish them before fruits go bad.
So for industrial pineapple peeling and mango peeling machine, there are indeed several machines you can count on.
