Multiple organizations for single email account

Hello, I have the following situation - I am registered to Zerotier with my job email account and I am admin of one Zerotier organization A. Recently I got invited to join another Zerotier organization B owned by Customer to setup some networks for them. When I entered the invitation screen, it stated that all my current networks will be automatically transfered to the new organisation B permanently. But this is not what I want for the networks set up in my original organization A. Will the networks from the organization A really transfered? If yes, is it necessary to create a new ZT account that will join the new organization B?