SD Gundam Gaiden - Knight Gundam Monogatari is a Japanese-only Nintendo Entertainment System game and a unique entry in the SD Gundam franchise. "Knight Gundam Monogatari" suggests that it focuses on the Knight Gundam unit, likely featuring a specific storyline centered around it.  Gameplay specifics are hard to find in English, but it almost certainly involves the strategic combat and action elements found in other SD Gundam games for the NES.  The focus on a specific Gundam unit sets this game apart from others in the series.

SD Gundam Gaiden - Knight Gundam Monogatari (Japan)

SD Gundam - Gachapon Senshi 3 - Eiyuu Senki (Japan)