/*********************************************
    Problem : HDU 5170
    Author  : NMfloat
    InkTime (c) NM . All Rights Reserved .
********************************************/

#include <map>
#include <set>
#include <queue>
#include <cmath>
#include <ctime>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <algorithm>

#define rep(i,a,b)  for(int i = a ; i <= b ; i ++)
#define rrep(i,a,b) for(int i = b ; i >= a ; i --)
#define repE(p,u) for(Edge * p = G[u].first ; p ; p = p -> next)
#define cls(a,x)   memset(a,x,sizeof(a))
#define eps 1e-8

using namespace std;

const int MOD = 1e9+7;
const int INF = 0x3f3f3f3f;
const int MAXN = 1e5;
const int MAXE = 2e5;

typedef long long LL;

int T,n,m,k;

char s1[105],s2[105];

void input() {
    scanf("%d",&n);
    scanf("%s%s",s1,s2);
}

void solve() {
    int lens = strlen(s1);
    int ok = 0;
    rep(i,0,lens-1) {
        if(s1[i] == 'A') if(s2[i] != 'U') ok = 1;
        if(s1[i] == 'T') if(s2[i] != 'A') ok = 1;
        if(s1[i] == 'C') if(s2[i] != 'G') ok = 1;
        if(s1[i] == 'G') if(s2[i] != 'C') ok = 1;
    }
    if(ok == 0) puts("YES");
    else puts("NO");
}

int main(void) {
    //freopen("a.in","r",stdin);
    scanf("%d",&T);
    while(T--) {
    //while(~scanf("%d %d %d %d",&a,&b,&c,&d)) {
        input();
        solve();
    }
    return 0;
}