The order of the rows in the absence of ORDER BY clause may be:

• different between any two storage engines;
• if you use the same storage engine, it might be different between any two versions of the same storage engine; Example here, scroll down to "Ordering of Rows".
• if the storage engine version is the same, but MySQL version is different, it might be different because of the query optimizer changes between those versions;
• if everything is the same, it could be different due to the moon phase and that is OK.

The order of the rows in the absence of ORDER BY clause may be:

• different between any two storage engines;
• if you use the same storage engine, it might be different between any two versions of the same storage engine; Example here, scroll down to "Ordering of Rows".
• if the storage engine version is the same, but MySQL version is different, it might be different because of the query optimizer changes between those versions;
• if everything is the same, it could be different due to the moon phase and that is OK.