Once an individual buck starts a scrape, virtually every buck that comes through the area will visit the scrape and potentially rework it.
Traditional scrapes are my favorite place to put trail-cams. Bucks learn these locations and learn to visit them through the rut. I can place a black-flash cam at a traditional scrape in mid-October, leave it until mid-December, and capture pictures of nearly every buck in that area. I often give known traditional scrapes a bit of a "kick start" early in the year (open them and pee in them around the beginning of October) to get bucks using them as early as possible.
But to answer your question, it's possible the same buck opened that scrape in the same place two years in a row, but far more likely any buck that used the area two years in a row eventually visited that scrape at some point during both years. In essence, a trail-cam would have captured his picture there two years in a row. I've captured the same buck on camera at the same scrape 3-4 years in a row.