#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;
struct e{

};
int main ()
{
    int t;
    scanf("%d",&t);
    while(t--)
    {
        int n;
        scanf("%d",&n);
        char a[200],b[200];
        scanf("%s%s",a,b);
        int s=0;
        for(int i=0;i<n;i++){
            if(a[i]=='A'&&b[i]=='U') s++;
            if(a[i]=='T'&&b[i]=='A') s++;
            if(a[i]=='C'&&b[i]=='G') s++;
            if(a[i]=='G'&&b[i]=='C') s++;
        }
        if(s==n) printf("YES\n");
        else printf("NO\n");
    }

}