When you update details for a SPG, the update is reflected in ALL the registrations connected to it (across the group).
For more information click here
A Secured Party Group (SPG) is used to create and manage registrations on the PPSR.
The email address linked to the SPG is used for:
all PPSR notifications (verification statements, tokens and access codes)
contact from the Registrar (e.g. to deliver an amendment notice); and
by any party querying the registration.
There are serious consequences for not keeping your details up to date. At worst, if you don't respond to an amendment statement, your registration may be removed or discharged.
TIP: Keep your details up to date!