I'm not in a position at the moment to compare their similarity, but that was apparently inferred through Makoto Tomozawa's being credited for MMZ3's Scrapped Beat, which references that melody:
https://vgmdb.net/forums/showthread.php?p=24087.
Quote:
Originally Posted by kyubihanyou
Makoto Tomozawa: Vava 1, Vava 2, Demo, Sigma Stage 3, Ending
-Vava 1 and Vava 2 confirmed via Rockman Zero 3's Scrapped Beat [Tomozawa given composition credit, but was not credited for "Music" in-game, but rather "Special Thanks"]. They all share the same four note melody.
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