02 focus oil filter

I recently did my first oil change on a 02 focus. It has a 2.0 zetec motor in it. I could not see anywhere on the car where it said dohc, but looking at the motor, I assumed it was one. I purchased a filter accordingly. Upon removing the old filter, I noticed quite a difference in the length of the filters. I took the old filter back to the store and discovered it was the same size as the filter tagged for the sohc. I exchanged filters and went ahead with the oil change. After digging into this a little more I see that the zetec is in fact a dohc. My question is; will running this filter on my motor be harmful in any way? Should I change it immediately or wait until my next scheduled oil change to do so?

Thanks

It will not hurt your engine, depending the the manufacturer some filters are longer then others. Oil filters are designed to fit many model of engines.

I think they are the same. At one point, FL400S is for SOHC only. There was a 500 or something. When I go to auto store now, i don't find that 500 anymore. It is all 400S.