Change Checkbox Caption on Userform with Name in Variable

I have a workbook where users select a specific type of notification email they want to create and send out. There are 8 different types of notifications that open different userforms (which all ask different questions, etc...). The one thing they have is common is a group of checkboxes with the same name that open another userform where the user can select the email groups they want the notification sent to.

After they've selected the groups they want to email and hit OK to close out of the email userform, I want to update the checkbox caption on the notification userform to display how many groups were selected. I really don't want to update the caption on all 8 userforms and instead would just like to update the caption on the userform that initiated the action.

I thought I could do this by storing the userform name in a variable (frmName) and then reference the variable and the checkbox... something like frmName.chk2.caption = "something". My variable is currently Public and stored in a module. I've tried different types like object, userform, string, etc... but I just bounce between various errors and can't seem to figure this out.

I have been trying to change it from the userform that displays the email groups they can select, in the code for the command button they will click to OK once they've chosen the groups. If I can figure out how to change the checkbox caption by using the userform name in a variable then it seems like I wouldn't have to duplicate so much code. If I try to do it from the notification userforms then I would have to do the code on each different form, unless I'm missing something.

I'm open to suggestions, but it seems like if there is a way to do this it would be the most efficient.