Year-on-Year, Point in Time Comparison

Hi all, I am relatively new to Looker but not to SQL and hoping someone can help me with an issue I'm having. I am trying to create a graph that will compare number of nights booked vs lead time (how far out people book). I want to compare 2021 so far, to the same time period in 2019. I can't see a way to filter for this specifically, does anybody know of a work around for this?

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