I'll repost the picture. These are factory capsules, one is cardioid, the other one is hyper(the one with wider plastic backplate holes).
Otherwise all the parameters are the same. Spacers, diaphragm tension etc.
You might notice that bras backplate holes are slightly smaller on hyper. But you can't do much about that. I haven't noticed that makes huge difference.
This is hightly experimental, and i don't have gear to measure polar pattern response, but you get less high end and dip in high midrange which is typical for hyper response compared to cardio for these capsules. And more sound reaching diaphragm through backplate is logical way to make hyper/super cardioid.
Try with gradually widening of holes. And be prepared to destroy capsule if you are doing this for the first time.