Thermobaric bombs are non-nuclear, so no radioactive fallout and a lot less burning and melting of things. Also, not as large an explosion as a typical nuke.

https://nypost.com/2022/03/01/what-are-thermobaric-bombs-russia-accused-of-using-weapon-against-ukraine/

https://military-history.fandom.com/wiki/Thermobaric_weapon

Most conventional explosives consist of a fuel-oxidizer premix (gunpowder, for example, contains 25% fuel and 75% oxidizer), whereas thermobaric weapons are almost 100% fuel, so thermobaric weapons are significantly more energetic than conventional condensed explosives of equal weight. Their reliance on atmospheric oxygen makes them unsuitable for use underwater, at high altitude, and in adverse weather. They do however cause considerably more destruction when used inside confined environments such as tunnels, caves, and bunkers - partly due to the sustained blast wave, and partly by consuming the available oxygen inside that confined space.

Russians have one "Father of all Bombs" that's bigger than our "Mother of all Bombs". Difference with explosion appearance would be same as Tactical nuke with no radiation.