Has an NPB (Japan) game ever ended 14-7?
It has. 14-7 has been a NPB (Japan) final 24 times in 63,173 games. The first was Taiyo Whales beat Osaka Tigers on May 26, 1950; the latest was Saitama Seibu Lions beat Chiba Lotte Marines on September 1, 2021.
That makes 14-7 the 109th most common final score out of 223 that have ever occurred in NPB (Japan). One point away, 15-7 has happened 26 times and 14-8 has happened 22 times.