Speed of mysql query

Is there a difference between the speed of these two queries

SELECT * FROM table WHERE field1='blabla' and field2='blabla'

SELECT * FROM table WHERE field2='blabla' and field1='blabla'

Shouldn't be.

Speed differences could occur based on what fields are indexed. But if the same field (or fields) are indexed in both versions, speed should be identical or nearly so.