I don’t have access to my rulers right now but I suspect the gripper dots on the back of the two rulers are in different places. That might have an effect on your current trimming. Unfortunately I can’t give you specific info on the rulers. You could try covering the ruler (back or front - won’t matter since you’re squaring to 4.5”) with Invisigrip. I have used it on my non-Creative Grids rulers and templates with excellent results.
Since you asked about other brands I will say that Quilters Select rulers have the grippy coating on the entire back of their rulers.