The results of any GTRR can be reproduced with a find. That might be very simple or very complex to do.
If you have a one to many relationship that is the basis for your GTRR, the you can set a variable to the current Primary Key value before you change layouts. This might be done via a global variable and OnRecordLoad on the layout you are leaving to enter this one or a navigation button that changes layouts for the user can perform a script that captures this value before changing layouts.
Either way, you script can now enter find mode and set the foreign key on your new layout's table to the value of this variable and perform the find. (of course, if you are using a navigation button to change layouts, it can simply do the GTRR each time so you might consider just using navigation buttons to control which layout a user accesses.
That is perfect, I already have a $$UserID set from login. Thank you!