Hello @Christina_ ,
Thank you for sharing all the data.
I apologize, I missed your very first question.
There's no dedicated Configuration Tools S32K3 R1.8 NPI for the S32K344.
Please check that you can see S32K344 in the new S32DS application project wizard:

Also, you should see S32K344 examples in Create S32DS Project from example wizard:

Best regards,
Pavel