#pragma comment(linker, "/STACK:1677721600")
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <cmath>
#include <bitset>
#include <vector>
#include <cstdio>
#include <string>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <algorithm>
using namespace std;
#define sf scanf
#define pf printf
#define INF 0x3f3f3f3f
#define mem0(a) memset(a,0,sizeof(a))
#define mem_1(a) memset(a,-1,sizeof(a))
#define FIN freopen("in.txt", "r", stdin)
#define FOUT freopen("out.txt", "w", stdout)

template <class T>
inline bool in(T &ret) {
    char c; int sgn;
    if (c=getchar(),c==EOF) return 0;
    while (c!='-'&&(c<'0'||c>'9')) c=getchar();
    sgn=(c=='-')?-1:1;
    ret=(c=='-')?0:(c-'0');
    while(c=getchar(),c>='0'&&c<='9') ret=ret*10+(c-'0');
    ret*=sgn;
    return 1;
}
template <class T>
inline void out(T x) {
    if(x<0){
        putchar('-');
        x=-x;
    }
    if(x>9) out(x/10);
    putchar(x%10+'0');
}

template<class T> T MAX(T a, T b) { return a > b ? a : b; }
template<class T> T MIN(T a, T b) { return a < b ? a : b; }
template<class T> T GCD(T a, T b) { return b ? GCD(b, a%b) : a; }
template<class T> T LCM(T a, T b) { return a / GCD(a,b) * b;    }

typedef long long LL;
typedef unsigned long long ULL;

const int MAXN = 50 + 10;
const int MAXM = 50 + 10;
const double eps = 1e-8;
LL MOD = 1000000007;



int main(){
    //FIN ;
    //FOUT; 
    int T;
    cin>>T;
    string s1,s2;
    for(int i=1;i<=T;i++){
        int nn;
        cin>>nn;
        cin>>s1;
        cin>>s2;
        //cout<<s1<<' '<<s2<<endl;
        int leng1=nn;//s1.size();
        int leng2=nn;//s2.size();
        //cout<<leng1<<' '<<leng2<<endl;
        //if(leng1!=leng2) {      cout<<"NO"<<endl;continue;}
        bool flag=1;
        for(int i=0;i<leng1;i++){
            if((s1[i]=='A'&&s2[i]=='U')||
                (s1[i]=='T'&&s2[i]=='A')||
                (s1[i]=='G'&&s2[i]=='C')||
                (s1[i]=='C'&&s2[i]=='G')
                ) ;
            else flag=0;
        }
        if(flag==0) cout<<"NO"<<endl;
        else cout<<"YES"<<endl;
    }
    
    
    return 0;
}

/*



*/