OALD defines the expressions as follows:
to take something into account: to consider particular facts, circumstances, etc. when making a decision about something
to take something into consideration: to think about and include a particular thing or fact when you are forming an opinion or making a decision
While they mean roughly the same thing, the word consideration being marked as formal leads me to believe that the difference between the two is purely stylistic.
Am I right in thinking that the difference is just a matter of style? Please clarify that one for me.