is it safe to use cilent 000 and 001 for testing

Hi Experts

I am working in SAP Pi 7.41 single stack

while trying to do the ALE settings...i have made the logical systems ECC000 and ECC001

than i have tried to assign these LS to client...i have assigned client 000 to LS ECC000 .

Is it safe to do so..?

I want to be sure by using these client the functionalies should not be change or no changes have been done which can ever effect the working by other resources.

or can i make the client by myself of testing??

Thanks in advance!!