Whether or not you can use a diaper instead of a catheter is something you need to determine based on your own situation and your own illness, and choose the way to do it under your doctor’s guidance, and catheters have a different scope of application than diapers.
Catheter is a kind of tube inserted into the bladder through the urethra in order to drain urine, and its role is different from that of diaper, which not only plays the role of draining urine, but also plays the role of supporting the urethra. It is therefore suitable for patients with urinary retention, bladder outlet obstruction, urinary incontinence, monitoring of urine output, patients who are unable or unwilling to collect urine and who are bedridden.
Incontinence can only be used in patients with urinary incontinence, so the overlap between the two is only incontinence, so only in this case you can switch to incontinence under the guidance of the doctor’s advice, but not for other reasons, so you need to ask your doctor whether you can replace it.