R - 移动窗口与不等大小的数据集进行比较

I need to compare a large set of values to a small set and find the minimum difference between the two. Maybe this is “moving window” comparison? I’ve looked at several time series packages but can’t find (or recognize) a function that compares data sets of different sizes. Text example below. Any help is greatly appreciated.I need to compare a large set of values to a sm