#include <cstdlib>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <queue>
#include <cmath>
#include <stack>
#include <map>
#include <set>
#include <deque>
#include <cstring>
#include <functional>
#include <climits>
#include <list>
#include <ctime>
#include <complex>
 
#define F1(x,y,z) for(int x=y;x<z;x++)
#define F2(x,y,z) for(int x=y;x<=z;x++)
#define F3(x,y,z) for(int x=y;x>z;x--)
#define F4(x,y,z) for(int x=y;x>=z;x--)
#define pb push_back
#define LL long long
#define co complex<double>
 
#define MAX 100005
#define AMAX 1500
#define MOD 1000000007

#define f(c,d) ((1<<(c))*(d))

using namespace std;

int t,n;
char x[105],y[105];
int cnt;

int main(){
    scanf("%d",&t);
    while(t--){
        scanf("%d%s%s",&n,x,y);
        cnt=0;
        F1(a,0,n){
            if(x[a]=='A'&&y[a]=='U')cnt++;
            if(x[a]=='T'&&y[a]=='A')cnt++;
            if(x[a]=='C'&&y[a]=='G')cnt++;
            if(x[a]=='G'&&y[a]=='C')cnt++;
        }
        printf(cnt==n?"YES\n":"NO\n");
    }
    //system("pause");
    return 0;
}