Winter Bike Sizing

Interested in buying a second hand winter training bike. My normal road bike frame is 58cm but the winter one is 56cm. Would this be ok. I haven't had a chance to look or get a test ride yet . Just curious as to what the general opinion would be.
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And you could always make the adjustment in reach to the bars (if you wanted to set up the same as your main bike) by fitting a slightly longer stem, provided you don't go over 120/130mm which can start to affect the handling.