Nope, they're different. Coffee grounds won't have as strong as a coffee flavor as espresso powder. Plus the grinds, unless you're able to grind them super finely, will be bigger compared to espresso powder that essentially disintegrates. You can use coffee grounds in this recipe but it won't have a strong u0022latteu0022 flavor! Instant espresso powder is also different from regular espresso powder. Instant espresso powder will have larger espresso crystals and a weaker coffee flavor, similar to regular coffee grounds.