Aleppo Pepper + Heat

Try it & see ;)

Aleppo isn't particularly hot; I haven't checked it on the Scoville scale, but just from experience, though it's got a little kick to it, & that kick can be quite variable depending on your source of the pepper, to me, aleppo is used for its flavour rather than its kick.

Cayenne, on the other hand, I always consider to be "free heat". Its largest contribution is to add the 'burn', it doesn't really have much flavour, it's mainly heat.
I always think that by the time you can actually taste cayenne, you have other concerns ;)

On an anecdotal note - I always put a little cayenne in meatballs & most tomato sauces that would go with them. It's just a family 'thing' - we like it that way.