#include<cstdio>
int cas,n,m,l,t,p;
char a[1000],b[1000];
int main(){
    scanf("%d",&cas);
    while (cas-->0){
        scanf("%d",&n);
        scanf("%s",a);
        scanf("%s",b);
        p=0;
        for (int i=1;i<=n;i++){
            if (a[i]=='A') if (b[i]!='U') p=1;
            if (a[i]=='C') if (b[i]!='G') p=1;
            if (a[i]=='G') if (b[i]!='C') p=1;
            if (a[i]=='T') if (b[i]!='A') p=1;
        }
        if (p==1)  printf("NO\n");
        else printf("YES\n");
    }
}