Track changes in Header text of sale order

we have a requirement somethign like this:

there are lots of header texts in sales order transactio code VA01.

We want to record changes made to these texts in every sales order.

Only changes in header texts should get recorded.

What i think is: (Please let me know what i am gguessing is absouletely absurd.)

Capture these texts after input by user somewhere in sale order source code and

finally save these texts everytime whenever changes are made in DB table(ztable).

i also looked at thread Saving text from text editor into ztable

@raymond giuseppi is saying to copy ztable structure from INDX.

And finally use export to DB.

What is the diff between Using insert To ztable or using Export statement.

Please shed some light.