Why do you feel the need to change? What is your goal?
I don't see the need to do an entirely different workout, there's only so many ways you can pick something up and put it down.
In the end as long as its activating the muscle you want to work than its a good exercise. I do believe the weight or at least reps should progressively change to higher numbers. If they're not then most likely your diet and recovery is not optimal. I recently increased my volume and lowered my weight range. Saw good improvements. I'm now changing to a powerlifting routine and after will go back to volume/ hypertrophy training.
Each time I keep the same exercises I only change my volume/ reps/ weight/ rest periods etc, even if I'm cutting. I rarely do cardio, only cut my rest periods down to keep my heart rate up similar to circuit training... Hope this helps.