Hi,

Thanks for your question.

Update the new node to be the same version before adding it to the cluster. https://dell.to/3vJcapo

Let us know if you have any additional questions.

You can check here for comapatibility.
VxRail Node Addition Matrix (dell.com)

If the existing VxRail cluster is running 7.0.452, you can add the node imaged with 7.0.370 without reimaging, because Node expansion script automatically upgrade a new node to the cluster version.

This feature takes 1 or 2 hours longer than as usual (node expansion without upgrade).
For troubleshooting and accuracy perspective of the operation, I prefer to reimage the new node beforehand.