Fitting an OEM rubber strap to an older Aqua Terra?

I've got a 38mm aqua terra in blue and love the rubber strap (19mm lug width):
I saw this listing showing what looks like an original Omega rubber setup on the old 2503 model, here's mine:
I've reached out to the guy on reddit but he hasn't gotten back to me. Can I order the 20mm setup from the 41mm aqua terra (the bigger version of my watch) and it bolts right on?
If there are any other good rubber alternatives I'm all ears.