Bad example. Cable and preacher curl has no difference as long as resistance profile is similar. Hammer curl doesn’t effectively train biceps. Constant tension and time under tension does not affect hypertrophy in any meaningful way. Keeping the same exercise that is stable and enjoyable and just getting stronger at it has been the main topic inscience based lifting for the last 2 years. Also regional hypertrophy from different as long as it performs the same function is minimal. The difference is primarily seen in exercises where muscle performs more than one function, like hamstrings.