Thanks.
@contentiskey – the structure is the same.
@bengreeley – I’m seeing the difference is because there’s an automatic wp-container-id class that is added to the blocks now following an update (WP 5.9 I think). The live site is still on 5.8.3, but the test site is on 6.1. In doing a little digging, I’ve noticed a number of other users have seen this cause layout issues on their sites but not sure how best to address. Any thoughts appreciated.