Hi @vstephe,
Thanks for your question.
The available machines names describe to which processor and board is supposed to be.
s32g399aevb3 is for processor S32G399A and board EVB3 (evaluation board).
s32g398aevb3 is for processor S32G398A and board EVB3 (evaluation board).
s32g379aevb3 is for processor S32G379A and board EVB3 (evaluation board).
s32g378aevb3 is for processor S32G378A and board EVB3 (evaluation board).
s32g399ardb3 is for processor S32G399A and board RDB3 (reference design board).
For your project use s32g399ardb3.