Replacing caps in my Kenwood KD990

I did start a thread about this deck a few years ago but can't find it now. I have replaced most of the electrolytics but made a mistake ordering 2 caps that were polarised when they should have been non polarised - can I use them?. Some of the new caps are much smaller than the original ones which were Elna, the new ones are Panasonic.should I be concerned about this?