unity – Nearest Vector3 to Vector3 from last frame

Suppose you have a Vector3 provider of pointcloud positions that update every frame – call it Nullable<NativeSlice<Vector3>> pointClouds

Say you want to use particles whose emitters create continuous animation effects, how do you find the nearest Vector3 in the current frame for a previous frame’s point cloud particle to “migrate” there (instead of being destroyed and re-created each frame)?