#include <cstdio>
#include <cstring>
#include <cstring>
#include <iostream>
#include <vector>
#include <cstdlib>
#include <cmath>
#include <algorithm>
using namespace std;

bool ok(char a, char b) {
    if (a == 'A' && b  == 'U') return true;
    if (a == 'T' && b == 'A') return true;
    if (a == 'C' && b == 'G') return true;
    if (b == 'C' && a == 'G') return true;
    return false;
}

int main(void) {
    ios::sync_with_stdio(0);
    int T;
    cin >> T;
    while (T -- > 0) {
        int n;
        cin >> n;
        string a, b;
        cin >> a >> b;
        bool flag = true;
        for (int i = 0; i < n; ++ i) if (!ok(a[i],b[i])) {
            flag = false;
            break;
        }
        if (flag) cout << "YES\n";
        else cout << "NO\n";
    }
    return 0;
}