Ignition coil for 6V P Vespa?

Hello,
please tell me one technical thing. I have an early 1978 P Vespa with 6V voltage and standard ignition coil (it’s looking like the ones on 12V PX). Please tell me can I buy this item:

Or, are ignition coils for 6V P model and 12V PX model the same?

Thanks,
Regards,
Tom