Import email database from 3.0.12 to 3.3.3 and keep memory of inscription date, confirmation etc (GDPR)


I have an email database inside an old installation of PHPList 3.0.12 and I would like to import adresses into an other PHPList installation (brand new, 3.3.3).

I created the same lists in 3.3.3 than in 3.0.12, I created the same user attributes too and now, I would like to import email adresses and keep memory of their inscription date, if they manually confirmed and so on…
Of course I would like to keep those information useful for GDPR…

Is there a way to achieve this ?
Or do you really advise me to upgrade the current installation to keep track of those informations ?

Thank you very much for your advices,