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

char s1[105], s2[105];

int main()
{
    int t;
    scanf("%d", &t);
    while (t--)
    {
        int n;
        scanf("%d%s%s", &n, s1, s2);
        bool flag = 1;
        for (int i = 0; i < n; i++)
        {
            if (s1[i] == 'A' && s2[i] == 'U') continue;
            if (s1[i] == 'T' && s2[i] == 'A') continue;
            if (s1[i] == 'C' && s2[i] == 'G') continue;
            if (s1[i] == 'G' && s2[i] == 'C') continue;
            flag = 0;
        }
        if (flag) printf("YES\n");
        else printf("NO\n");
    }
    return 0;
}