3 in 1 charger

What's the 3rd part of the charger?

iPhone, Apple Watch and...?

Apple offers this 2 in 1 for iPhone and Apple Watch: link-> MagSafe Duo Charger - Apple

Belkin offers this. one for iPhone, Apple Watch and AirPods: link-> https://www.apple.com/shop/product/HPU82ZM/A/belkin-boost↑charge™pro-3-in-1-wireless-charging-pad-with-magsafe

Can't 100% guarantee it since I don't own either one of them. But as I said the charging mechanisms have not changed so there is absolutely no reason to think it won't work.

If bought directly from Apple, you have 14 days to return it for a full refund no questions asked in the event it does not work.

Does not matter if it's opened.

The compatibility listing has not been updated to include iPhone 14, but it should be compatible. The charging method has not changed between iPhone 13 and 14.

Still supports Magsafe, and Qi charging.

It applies to both. Both chargers I linked to should be compatible with iPhone 14.