#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;

int a[100005], b[100005], ind_a[100005], ind_b[100005];
bool used[100005] = {false};

int main() {
  int t, n, ans;
  scanf("%d", &t);
  while(t--) {
    scanf("%d", &n);
    memset(used, false, sizeof(used));
    for(int i = 1; i <= n; i++) {
      scanf("%d", &a[i]);
      ind_a[a[i]] = i;
    }
    for(int i = 1; i <= n; i++) {
      scanf("%d", &b[i]);
      ind_b[b[i]] = i;
    }
    ans = 0;
    for(int i = 1; i <= n; i++) {
      int p = a[i];
      if(!used[b[ind_a[p]]]) {
      used[b[ind_a[p]]] = true;
      if(p == b[ind_a[p]]) ans++;
      while(!used[p]) {
    used[p] = true;
    ans++;
    p = a[ind_b[p]];
      }
      }
    }
    printf("%d\n", ans);
  }
  return 0;
}