OSCAR on multiple machines SD card

I am waiting for delivery of a used ResMed Airsense 10 Autoset I've bought to use when I send my ResMed Airsense 11 Autoset out for repair, and then to keep as a backup. A forum search told me that OSCAR can integrate the data from the two machines, but do I use the same SD card or a different one?

I have used the same SD Card for my AS10 and S9. My Oscar report summary shows the 2 machines.

same as lsat: i have 2 machines on one card.

You don't have to use the same card.
I have multiple machines showing in OSCAR and I have used multiple cards.
You can do it either way.