Katalon doesn’t recognize/differentiate Custom Keywords with same name but diffetent parameters:
In the Script View:
In the Manual View (show both verifyNotificationMessage keywords):
In the Manual View (when one is selected, just the single parameter keyword is used in Manual View; even the script is edited to use other):
2018-10-01 Custom Keywords, same name, different parameters_01.jpg
2018-10-01 Custom Keywords, same name, different parameters_02.jpg
2018-10-01 Custom Keywords, same name, different parameters_03.jpg
2018-10-01 Custom Keywords, same name, different parameters_04.jpg