interchange MySQL/MariaDB .frm files Is there any effect if i interchange MySQL/MariaDB .frm files from dbs with similar structure on any CRUD operation?

note: the different is some tables have different fields, whether its existence, datatype, default value or any others.
The .frm drives the parsing of rows.  So if the datatype or number of columns changes, it seems very likely that the rows cannot be read.

Consider using a VIEW to "change" the structure of a table.