Define and fill datastructure using the record format name

This seemed simple enough until it exploded in my face this morning.

I have a screen with 7 input/output capable fields. Lets call that record name FMT01.

I want to define a datastructure as being like FMT01, and then have it automagically be populated with the values from the 7 input/output capable fields whenever it is used in a calc.

I also want 2 standalone fields (OLDVALUES & NEWVALUES) that are like the datastructure

The purpose is to make these lines work:

OLDVALUES = DataSt;
EXFMT FMT01;
NEWVALUES = DataSt
if OLDVALUES <> NEWVALUES:
.... do stuff.

Is that possible? Have I taken the Stupid Pill again?