Your post contains many details that confuse me.
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there is no release detail, so we can only be generic. Ubuntu ISOs since 20.10 have altered slightly for each release (esp. in regards booting) so all architectures boot the same way, so release actually matters (unless 20.04 or earlier).
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calamares
isn't used by Ubuntu MATE, however it has been used by flavor(s) since 18.10 (which flavors also varying by release; being Lubuntu, Ubuntu Studio, Kubuntu, Ubuntu Unity) so I do know for surecalamares
is QA tested & works with any release of 18.10 & later; as I've used it myself in QA many times.
Are you asking about Ubuntu MATE?; as ubuntu-desktop-installer
or ubiquity
are the installers used, and importantly what release. If I wanted to see how calamares
configs worked for a specific release, I'd just pick one of the configs used by that release (common and a flavor ; though do note the configs are expected to change substantially for 24.10/oracular)