#include <cstdio>
#include <iostream>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <vector>
#include <queue>
using namespace std;
const int N=105;
int T,n;
char s1[N],s2[N];

bool check()
{
    for (int i=1;i<=n;i++)
    {
        if (s1[i]=='A'&&s2[i]!='U') return 0;
        if (s1[i]=='T'&&s2[i]!='A') return 0;
        if (s1[i]=='C'&&s2[i]!='G') return 0;
        if (s1[i]=='G'&&s2[i]!='C') return 0;
    }
    return 1;
}

int main()
{
    cin>>T;
    while (T--)
    {
        scanf("%d\n%s\n%s",&n,s1+1,s2+1);
        if (check()) printf("YES\n"); else printf("NO\n");
    }
}