Yum Yum sauce is not the same as boom boom sauce, although they are similar creamy and mayo based sauces.
However yum yum sauce is often sweeter and milder and contains mayo, sugar, ketchup and tomato.
And boom boom sauce adds more spice ingredients like the sriracha and sweet chili to give it a spicy sweet kick.
Some recipes for boom boom sauce also add garlic.
You can think of Yum Yum sauce as being sweet and tangy and think of Boom Boom Sauce as being sweet and spicy.
So while yum yum sauce is similar to boom boom sauce, they are different sauces.
Another name for yum yum sauce is shrimp sauce.
Nearly every teppanyaki restaurant will serve yum yum sauce although the name can also differ depending on the restaurant.
White sauce is also a deceptive moniker for yum yum sauce, and shrimp sauce, yummy yummy sauce as well as yum yum sauce are also used interchangeably to refer to the same sauce.
To make a Yum Yum sauce substitute you can use a base of some mayonnaise that is mixed with some Sriracha or sweet chili sauce, ketchup/tomato paste, rice vinegar, garlic powder and even a touch of sugar or honey, with melted butter for added richness.
For healthier options you can also swap the mayonnaise for some Greek Yogurt or even use Thousand Island dressing for a store bought shortcut, although homemade is always best for authenticity.