Last changing value from a spread

Hello,
I have a spread of two values moving separately, I need to access both values but when they move more or less at the same time I want just the one that moved for last.
I thought about CAR and CDR but they work just for index while I need to monitor the whole spread. There’s a node I’m missing or a smart way for doing this?
Thanks

have a look at change and select.

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