Demon Slayer season 2 seems like it has the same content of Mugen

EVERY change in the Mugen Train Arc (Demon Slayer Season 2)

Demon Slayer Season 2: Everything We Know About So Far

Demon Slayer' season 2: release date, plot details, and everything we know so far

How Demon Slayer Can Stay Relevant After Mugen Train's Success

I noticed that the intro of the Mugen Train Arc and the Red District Arc have the same shots :0 : r/DemonSlayerAnime

Demon Slayer (Kimetsu no Yaiba)': Do you need to watch 'Mugen Train' before season 2 comes out?

Review: 'Demon Slayer: Mugen Train' - Murphy's Multiverse

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Demon Slayer Mugen Train Arc Episode 1 Review - A Great Prologue