There is a huge difference.

Ask an average American to give you the length of their car, size of their kitchen or weight of a brick in metric and they'll have no clue. The average British person can do this, because education has been metric for 50+ years and the least-technical industry (e.g. construction, DIY) is metric.

(See e.g. https://www.diy.com/, the largest consumer-facing DIY shop in Britain. It's 20kg of 10mm gravel, doors in millimetres, paint in litres. I can't even see a button offering an imperial conversion.)