A B737 TECHNICIAN RPTS REPLACING A LEADING EDGE FLAP AND SIGNING FOR THE REPLACEMENT. RELIEF TECHNICIANS REMOVED FLAP AND REINSTALLED CORRECT FLAP.

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ON AUG/THU/05; I AND TECHNICIAN Y WENT TO ZZZ; CONTINUED THE INSTALLATION OF #3 KRUGER FLAP (SERIAL #XXX) ON ACFT X THAT TECHNICIAN Z FROM PREVIOUS SHIFT DIDN'T FINISH. AS PER THE MANUAL; WE CONTINUED WHERE TECHNICIAN Z LEFT OFF. I CONTINUED TO STEP 19. AT STEP 20 I DIDN'T GET THE CLRNC CALLED OUT; SO I BROUGHT IT TO THE ATTN OF INSPECTOR A AND FOREMAN B AS TO DECIDE NEXT COURSE OF ACTION. AT THE END OF THE SHIFT; I SIGNED FOR COMPLETING STEPS 1J TO 19 THINKING THAT ENGINEERING WOULD GIVE THE CLRNC. I TURNED THE ACFT OVER TO NEXT SHIFT. THEY COULDN'T GET RELIEF SO THEY REMOVED #3 KRUGER FLAP AND INSTALLED ANOTHER WHICH WAS ROBBED FROM ANOTHER ACFT; WHILE LEAVING MY SIGNATURE FOR STEPS I COMPLETED ON SERIAL #XXX. NOTE: THE REASON THE CLRNC DIDN'T MEET THE AMM IS BECAUSE ENGINEERING AUTH XXXXX WAS DONE ON SERIAL #XXX. THE FLAP I HELPED INSTALL HAD STICKERS WITH ENGINEERING AUTH XXXXX STUCK TO THE INSIDE OF THE FLAP. THE PAPERWORK ONLY SHOWS THE ORIGINAL FLAP REMOVED AND THE ROBBED FLAP INSTALLED. I AM WRITING THIS BECAUSE PAPERWORK SHOWS ME SIGNING FOR THE INSTALLATION OF THE ROBBED FLAP; WHICH I HAD NO HAND IN. THERE IS NO MENTION OF THE REMOVAL OF SERIAL #XXX BY THE NEXT SHIFT MECHS.