Has TD5 ECU pairing with AS10?

Hi all,
I got a spare ECU today I want to test in my TD5. Is it safe to test the new used ECU just by swapping or do I have any issues because AS10 is blocking then? Or in other words, do I have to pair the new ECU with AS10 and to pair again my old ECU after test with AS10?
Thanks & Best Mario

You will need to pair it, then pair it again once the old one is back in.

Thanks for reply. Ok, I have a Nanocom and I found the respective part in the manual. So, procedure is:
1. Connect the new ECU
2. Turn on ignition
3. In Nanocom start "Learn Security Code" procedure, following instructions....
4. Write Injector Codes
5. Have fun?
Right?

Ok, I tried the sequence above...everything works fine It's really easy.
@tom1979 Thx