Move itab1 to itab2 if some fields afre different

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Hello

What is the best way to move data from table itab1 to table itab2.

Both tables are the standard tables of the following structures :

itab1 itab2

F1 F2 F3 F4 F1 F2 F5 F6

I know loop into but hope there is more sphisticated way to do it

Thanks