The S. 4446 bill wants to allow a group called NIST to also look at problems with things like bridges or tunnels, not just buildings, so they can make safety rules better. If there are other groups better at checking these things, NIST should let them handle it instead.

The bill wants to let a group of experts check more than just buildings, like bridges and towers, to make sure they are safe and built well. They're changing some words in the law to say "structures" instead of just "buildings" so they can help make better rules for building all kinds of things safely.

H.R. 4143 is a plan to let experts check not just buildings, but other structures too, like bridges, to make sure they are safe and help make better rules on how to build them. If another group of experts is better suited to do the checking, then this team will let them take over.