#include <stdio.h>
#include <string.h>
#include <algorithm>

using namespace std;

int main()
{
    int t;
    scanf("%d",&t);
    while(t--){
        char D[110],R[110];
        int N;
        scanf("%d",&N);
        scanf("%s%s",D,R);
        int LD=strlen(D);
        int LR=strlen(R);
        if(LD!=LR){
            printf("NO\n");
            continue;
        }
        int flag=1;
        for(int i=0;i<N;i++){
            if(D[i]=='A'&&R[i]=='U')continue;
            else if(D[i]=='T'&&R[i]=='A')continue;
            else if(D[i]=='C'&&R[i]=='G')continue;
            else if(D[i]=='G'&&R[i]=='C')continue;
            flag=0;
        }
        if(flag)printf("YES\n");
        else printf("NO\n");
    }
    return 0;
}