At the risk of "falling short" of your expectations - let me explain the missing information you are not taking into account.
On AbanteCart Version PRIOR to 1.2.0 the storefront that you like was named default_html5 when it was introduced. It replaced a much earlier template called default. The first default template is very out-dated and not well support in the high 1.1. xx versions.
When the version 1.2.0 was released with a lot of behind coding updated to more current versions, the highly preferred default_html5 was
renamed for use in version 1.2.0 and forward to just default.
That means all the refereneces to the template you like has a different name depending on which version you are using.
Prior to version1.2.0 the name is default_html5, from 1.2.0 forward it is called default.
this has been explained on the forum previously. And it is a detail that is most important. But that is why you can't just pluck a file from 1.2.0 and place it in a 1.1.9 cart - as the name for the template has changed. So there really aren't two 'different' templates, but the same template with two different names depending on the version.
I hope this helps you clarify some of your confusion. And doesn't earn me another smite from you
.