SAT II Math vs ACT Math

I am currently preparing for both the ACT and SAT II math. I have found myself to struggle on the last 10-20 problems on the ACT Math and I was wondering if anyone with experience with both could tell me if studying for the Math II Subject will help me boost my math score on the ACT especially getting the very hard questions.
Are the SAT II math questions equivalent in difficulty to the last 20 problems on ACT?

The SAT II math questions are not going to align with the ACT as the math II subject test covers a much wider array of topics and harder topics than the ACT (in my opinion). It probably won’t hurt you, but the best way to boost your math score on the ACT is to get a prep book and practice problems from the math section.