No they are not equivalent.
When you multiply a number raised to an exponent to an identical number with an exponent you actually add the exponents together, not multiply them.
So x^3 * x^3 * x^3 would simplify to x^9
The second equation has a single value raised to exponents multiplied by each other so x^3*3*3 would simplify to x^27
X^9 is not the same as x^27
