/**************************************************************
    User: error408
    Language: C/C++
    School: SSDUT
    Saying: Do one thing at a time,and do well.
****************************************************************/
#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <cstdio>
#include <string>
#include <cstring>
#include <cmath>
#include <ctime>
using namespace std;

#pragma comment(linker,"/STACK:102400000,102400000")
#define clr(s,x) memset((s),(x),sizeof(s))
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define lowbit(x) (x&(-x))
#define PB push_back
#define RL(N) scanf("%I64d",&N)
#define RLL(L,R) (RL(L),RL(R))
#define lch(x) x<<1
#define rch(x) x<<1|1

typedef long long               LL;
typedef unsigned int            uint;
typedef unsigned long long      ULL;
typedef vector<int>             vint;
typedef vector<string>          vstring;

/************************************END DEFINE*********************************************/

const int maxn = 105;
string a,b;

int main()
{
    int t;
    cin>>t;
    while(t--){
        int n;
        cin>>n;
        cin>>a>>b;
        bool ok = true;
        for(int i=0;i<n;i++){
            if(a[i] == 'A'){
                if(b[i] != 'U')ok=false;
            }
            if(a[i] == 'T')if(b[i]!='A')ok=false;
            if(a[i] == 'C')if(b[i]!='G')ok=false;
            if(a[i] == 'G')if(b[i]!='C')ok=false;
        }
        if(ok)puts("YES");
        else puts("NO");
    }
}