#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int n;
char s[1000],ss[1000];
int main(){
    int tt;scanf("%d",&tt);
    for (;tt--;){
        scanf("%d%s%s",&n,&s,&ss);
        int is=1;
        for (int i=0;i<n;i++) if (!(s[i]=='A'&&ss[i]=='U'||s[i]=='T'&&ss[i]=='A'||s[i]=='C'&&ss[i]=='G'||s[i]=='G'&&ss[i]=='C'))
            is=0;
        if (is) puts("YES");
        else puts("NO");
    }
}