“Take the lead” is certainly an expression used in the UK to denote guiding people, as in “I’ll take the lead”. I assume both come from ballroom dancing.

I’m sure it’s used elsewhere but it may also simply be a conflation of the two.

I move back and forth between the standards. My laptop and 75% mechanical are ANSI, my work laptop and Bluetooth keyboard are ISO.

You’d be surprised how quickly you get used to switching between them.