Yes you can use kin one cases for kin onem. The difference between the kin one and the kin one m is not the size or shape. It is that there is no loop or the dot on kin onem

The differences between the kin one and the kin onem:

KIN ONE- Has this thing called the loop, this thing called the dot, and it does not have a calendar.

KIN ONEM- Does not have the loop, the dot, and has a calendar.

Kith and kin means friends and acquaintances (kith) and relatives (kin).

Dan is my kin. kin means family member or relative.

Next of kin means a person's nearest relative. Kin = family.