Yes, you can put a 20mm strap on a 19mm lug width watch and a 22mm strap on a 21mm lug watch
Watch Strap Sizing Explained [2022 Guide] • The Slender Wrist
Black & Tan Strap for Bags 1.5 Wide Nylon Adjustable - UK
A How-to Guide for Choosing Your Cross Body Strap Length – Mautto
How to Choose Your Signature Chain Strap Style – Mautto
Carl Friedrik
Watch Strap Sizing Explained [2022 Guide] • The Slender Wrist
NATO-style straps without the big loops
Backless Bandeau Bikini Top - Black - Ladies
How to Choose a Strap Size that is Just Right for You – Mautto