Remember that there are URMs and there are URMs.
Yes, hispanics are URMs. However a larger hook is a hispanic URM US citizen with multi-generational roots from Puerto Rice, Mexico and DR.
A low income, first generation student who attends a low performing school that is a high performing student (despite all of this) is a bigger hook than a URM of privilege (those who much have been given, much is required).
And also URM males are the real the hook on the college landscape because AA and Hispanic females attend colleges at a higher rate than their male counterparts (black males are the lowest represented population on college campuses). In your case, being from Venezuela is not a hook.
Op and her sister need to do their own college list based based on their own interest and academics. It may be a challenge for both of them to be accepted to the same schools when on twin is an A student and the other twin is a solid B student (I agree with the poster who said that if you apply to schools that are in your sister’s range, they may think that you are using them as a safety and will not attend if your sister is not accepted) .
Actually, what your sisters record says is that on SAT day she shows up and shows out. However, her GPA, which is reflective of what she does when she walks into the classroom every day tells a different story (GPA still trumps test scores because it does show what you do every day).
One of the other challenges with twins is that you need to present your self as separate entities when in schools many times you are viewed as a singular entity - the twins (especially true if you are identical twins).
The more selective the school is, the more likely they are not using your weighted GPA because the majority of the students are bringing AP/IB to the table if their school offers it.