A different calendar doesn’t necessitate mean a different year length. We still measure a year as a complete solar cycle, and that hasn’t changed.

There are many nuances in how a year is and was determined

"nuances" as in ... seconds? minutes? days?

The Roman calendar was just a lunar month times ten until being fixed to a solar year around like 500 BC

I don't know if there are retroactive fixes to what years were which and if that coincides with the Bible or universal acceptance of their solar calendar

Let me know

> Roman calendar was just a lunar month times ten

Plus the winter, which was unassigned until it eventually became January and February. I don't see anything about it counting the entire year as anything other than a solar year.

yes, years were the same... keep in mind that "year" (but also "season") were of the most importance for agricultural people.